diff --git a/css/style.css b/css/style.css
index 2feb820..d42bfec 100755
--- a/css/style.css
+++ b/css/style.css
@@ -28,10 +28,12 @@ button {
   border: 0px;
   color: #888;
   font-size: 15px;
-  width: 60px;
+  width: auto;
   margin: 10px 0 0;
   font-family: Lato, sans-serif;
   cursor: pointer;
+  transition: color 0.2s ease;
+  padding: 0 10px;
 }
 button:hover {
   color: #333;
@@ -117,4 +119,99 @@ ul li.editMode input[type=text] {
 
 ul li.editMode label {
   display:none;
+}
+
+/* Stats and Filters */
+.stats {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin: 20px 0;
+  padding: 10px;
+  background: #f5f5f5;
+  border-radius: 6px;
+  font-size: 14px;
+  color: #666;
+}
+
+#task-count {
+  font-weight: 300;
+}
+
+.clear-completed {
+  background: #fff;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  padding: 5px 10px;
+  font-size: 13px;
+  color: #888;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.clear-completed:hover {
+  background: #0FC57C;
+  color: #fff;
+  border-color: #0FC57C;
+}
+
+.filters {
+  display: flex;
+  justify-content: center;
+  gap: 10px;
+  margin: 20px 0;
+  padding: 10px;
+  background: #f5f5f5;
+  border-radius: 6px;
+}
+
+.filter-btn {
+  background: #fff;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  padding: 8px 16px;
+  font-size: 14px;
+  font-weight: 500;
+  color: #888;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.filter-btn:hover {
+  background: #0FC57C;
+  color: #fff;
+  border-color: #0FC57C;
+}
+
+.filter-btn.active {
+  background: #0FC57C;
+  color: #fff;
+  border-color: #0FC57C;
+}
+
+/* Responsive Design */
+@media (max-width: 480px) {
+  .container {
+    width: 95%;
+    margin: 50px auto 0;
+  }
+  
+  .stats {
+    flex-direction: column;
+    gap: 10px;
+    align-items: stretch;
+  }
+  
+  .filters {
+    flex-direction: column;
+    gap: 8px;
+  }
+  
+  .filter-btn {
+    padding: 10px;
+  }
+  
+  input#new-task {
+    width: calc(100% - 80px);
+  }
 }
\ No newline at end of file
diff --git a/index.html b/index.html
index 66f032d..b0a82c8 100755
--- a/index.html
+++ b/index.html
@@ -11,6 +11,19 @@
         <label for="new-task">Add Item</label><input id="new-task" type="text"><button>Add</button>
       </p>
       
+      <!-- 统计区域 -->
+      <div class="stats">
+        <span id="task-count">0 tasks · 0 completed</span>
+        <button id="clear-completed" class="clear-completed">Clear Completed</button>
+      </div>
+      
+      <!-- 过滤按钮 -->
+      <div class="filters">
+        <button class="filter-btn active" data-filter="all">All</button>
+        <button class="filter-btn" data-filter="active">Active</button>
+        <button class="filter-btn" data-filter="completed">Completed</button>
+      </div>
+      
       <h3>Todo</h3>
       <ul id="incomplete-tasks">
         <li><input type="checkbox"><label>Pay Bills</label><input type="text"><button class="edit">Edit</button><button class="delete">Delete</button></li>
diff --git a/js/app.js b/js/app.js
index 56952d9..c9e3304 100755
--- a/js/app.js
+++ b/js/app.js
@@ -1,9 +1,15 @@
-                                                                          // Vanila JavaScript todo list app
+// Vanila JavaScript todo list app
 var taskInput = document.getElementById("new-task");                      // New-task
 var addButton = document.getElementsByTagName("button")[0];               // First button
 var incompleteTasksHolder = document.getElementById("incomplete-tasks");  // Incomplete-tasks
 var completedTasksHolder = document.getElementById("completed-tasks");    // Completed-tasks
 
+// New elements for filters and stats
+var filterButtons = document.querySelectorAll(".filter-btn");
+var taskCountSpan = document.getElementById("task-count");
+var clearCompletedButton = document.getElementById("clear-completed");
+var currentFilter = "all";
+
 var createNewTaskElement = function(taskString) {       // New Task List Item
   var listItem = document.createElement("li");          // Create List Item
   var checkBox = document.createElement("input");       // Input (checkbox)
@@ -35,11 +41,14 @@ var addTask = function() {                            // Add a new task
   incompleteTasksHolder.appendChild(listItem);        // Append listItem to incompleteTasksHolder
   bindTaskEvents(listItem, taskCompleted);            // We bind it to the incomplete holder
   taskInput.value = "";                               // Resets the field
+  updateStats();                                      // Update stats after adding task
+  applyFilter();                                      // Apply current filter
+  saveToLocalStorage();                               // Save to localStorage
 };
 
 var editTask = function() {                                     // Edit an existing task
   var listItem = this.parentNode;                               // Create List Item
-  var editInput = listItem.querySelector("input[type=text");    // Input (text)
+  var editInput = listItem.querySelector("input[type=text]");    // Input (text)
   var label = listItem.querySelector("label");                  // Label
   var button = listItem.getElementsByTagName("button")[0];      // Button
 
@@ -47,6 +56,7 @@ var editTask = function() {                                     // Edit an exist
   if(containsClass) {                                           // Switch from .editMode
       label.innerText = editInput.value;                        // Label text become the input's value
       button.innerText = "Edit";                                // Buttons name modified to Edit
+      saveToLocalStorage();                                     // Save to localStorage after edit
   } else {                                                      // Switch to .editMode
      editInput.value = label.innerText;                         // Input value becomes the label's text
      button.innerText = "Save";                                 // Button name modified to Save
@@ -58,18 +68,26 @@ var deleteTask = function() {      // Delete an existing task
   var listItem = this.parentNode;  // We use parentNode to target the object containing the delete button
   var ul = listItem.parentNode;    // We use parentNode again to target the list containing the task
   ul.removeChild(listItem);        // Remove the parent list item from the ul
+  updateStats();                    // Update stats after deleting task
+  saveToLocalStorage();             // Save to localStorage
 };
 
 var taskCompleted = function() {               // Mark a task as complete
   var listItem = this.parentNode;              // We assign it for readability
   completedTasksHolder.appendChild(listItem);  // Append the task list item to the #completed-tasks
   bindTaskEvents(listItem, taskIncomplete);    // We bind it to the opposite holder
+  updateStats();                                // Update stats after completing task
+  applyFilter();                                // Apply current filter
+  saveToLocalStorage();                         // Save to localStorage
 };
 
 var taskIncomplete = function() {               // Mark a task as incomplete
   var listItem = this.parentNode;               // We assign it for readability
   incompleteTasksHolder.appendChild(listItem);  // Append the task list item to the #incomplete-tasks
   bindTaskEvents(listItem, taskCompleted);      // We bind it to the opposite holder
+  updateStats();                                // Update stats after incompleting task
+  applyFilter();                                // Apply current filter
+  saveToLocalStorage();                         // Save to localStorage
 };
 
 var bindTaskEvents = function(taskListItem, checkBoxEventHandler) {   // Select it's children
@@ -81,17 +99,162 @@ var bindTaskEvents = function(taskListItem, checkBoxEventHandler) {   // Select
   checkBox.onchange = checkBoxEventHandler;                           // Bind checkBoxEventHandler to checkbox
 };
 
+// Filter functions
+var applyFilter = function() {
+  var incompleteTasks = incompleteTasksHolder.children;
+  var completedTasks = completedTasksHolder.children;
+  
+  // Show/hide incomplete tasks based on filter
+  for(var i = 0; i < incompleteTasks.length; i++) {
+    var task = incompleteTasks[i];
+    if(currentFilter === "all" || currentFilter === "active") {
+      task.style.display = "list-item";
+    } else if(currentFilter === "completed") {
+      task.style.display = "none";
+    }
+  }
+  
+  // Show/hide completed tasks based on filter
+  for(var i = 0; i < completedTasks.length; i++) {
+    var task = completedTasks[i];
+    if(currentFilter === "all" || currentFilter === "completed") {
+      task.style.display = "list-item";
+    } else if(currentFilter === "active") {
+      task.style.display = "none";
+    }
+  }
+  
+  // Update h3 visibility based on filter and task counts
+  var hasIncomplete = incompleteTasksHolder.children.length > 0 && (currentFilter === "all" || currentFilter === "active");
+  var hasCompleted = completedTasksHolder.children.length > 0 && (currentFilter === "all" || currentFilter === "completed");
+  
+  document.querySelector("h3:nth-of-type(1)").style.display = hasIncomplete ? "block" : "none";
+  document.querySelector("h3:nth-of-type(2)").style.display = hasCompleted ? "block" : "none";
+};
+
+var setFilter = function(filter) {
+  currentFilter = filter;
+  
+  // Update button states
+  filterButtons.forEach(function(button) {
+    if(button.dataset.filter === filter) {
+      button.classList.add("active");
+    } else {
+      button.classList.remove("active");
+    }
+  });
+  
+  applyFilter();
+};
+
+// Stats functions
+var updateStats = function() {
+  var totalTasks = incompleteTasksHolder.children.length + completedTasksHolder.children.length;
+  var completedTasks = completedTasksHolder.children.length;
+  var activeTasks = incompleteTasksHolder.children.length;
+  
+  taskCountSpan.innerText = totalTasks + " tasks · " + completedTasks + " completed · " + activeTasks + " active";
+};
+
+// Clear completed tasks
+var clearCompleted = function() {
+  while(completedTasksHolder.firstChild) {
+    completedTasksHolder.removeChild(completedTasksHolder.firstChild);
+  }
+  updateStats();
+  applyFilter();
+  saveToLocalStorage();
+};
+
+// LocalStorage functions
+var saveToLocalStorage = function() {
+  var tasks = {
+    incomplete: [],
+    completed: []
+  };
+  
+  // Save incomplete tasks
+  for(var i = 0; i < incompleteTasksHolder.children.length; i++) {
+    var task = incompleteTasksHolder.children[i];
+    var label = task.querySelector("label");
+    tasks.incomplete.push(label.innerText);
+  }
+  
+  // Save completed tasks
+  for(var i = 0; i < completedTasksHolder.children.length; i++) {
+    var task = completedTasksHolder.children[i];
+    var label = task.querySelector("label");
+    tasks.completed.push(label.innerText);
+  }
+  
+  localStorage.setItem("todoTasks", JSON.stringify(tasks));
+};
+
+var loadFromLocalStorage = function() {
+  var tasks = JSON.parse(localStorage.getItem("todoTasks"));
+  
+  if(tasks) {
+    // Clear existing tasks
+    while(incompleteTasksHolder.firstChild) {
+      incompleteTasksHolder.removeChild(incompleteTasksHolder.firstChild);
+    }
+    while(completedTasksHolder.firstChild) {
+      completedTasksHolder.removeChild(completedTasksHolder.firstChild);
+    }
+    
+    // Load incomplete tasks
+    for(var i = 0; i < tasks.incomplete.length; i++) {
+      var taskString = tasks.incomplete[i];
+      var listItem = createNewTaskElement(taskString);
+      incompleteTasksHolder.appendChild(listItem);
+      bindTaskEvents(listItem, taskCompleted);
+    }
+    
+    // Load completed tasks
+    for(var i = 0; i < tasks.completed.length; i++) {
+      var taskString = tasks.completed[i];
+      var listItem = createNewTaskElement(taskString);
+      var checkBox = listItem.querySelector("input[type=checkbox]");
+      checkBox.checked = true;
+      completedTasksHolder.appendChild(listItem);
+      bindTaskEvents(listItem, taskIncomplete);
+    }
+    
+    updateStats();
+    applyFilter();
+  }
+};
+
 var ajaxRequest = function() {
   console.log("AJAX request");
 };
 
+// Event listeners
 addButton.addEventListener("click", addTask);      // Adds event listener for the click handler to the addTask function
 addButton.addEventListener("click", ajaxRequest);  // Adds an event listener for AJAX
 
+// Filter button event listeners
+filterButtons.forEach(function(button) {
+  button.addEventListener("click", function() {
+    setFilter(this.dataset.filter);
+  });
+});
+
+// Clear completed button event listener
+clearCompletedButton.addEventListener("click", clearCompleted);
+
+// Load tasks from localStorage on page load
+window.addEventListener("load", function() {
+  loadFromLocalStorage();
+});
+
 for(var i = 0; i < incompleteTasksHolder.children.length; i++) {     // Cycle over incompleteTasksHolder ul list items
   bindTaskEvents(incompleteTasksHolder.children[i], taskCompleted);  // Bind events to list item's children (taskCompleted)
 }
 
 for(var i = 0; i < completedTasksHolder.children.length; i++) {      // Cycle over completedTasksHolder ul list items
   bindTaskEvents(completedTasksHolder.children[i], taskIncomplete);   // Bind events to list item's children (taskIncomplete)
-}
\ No newline at end of file
+}
+
+// Initial stats update
+updateStats();
\ No newline at end of file