diff --git a/css/style.css b/css/style.css
index 2feb820..3a51800 100755
--- a/css/style.css
+++ b/css/style.css
@@ -36,6 +36,95 @@ button {
 button:hover {
   color: #333;
 }
+
+/* Filter Panel */
+.filter-panel {
+  margin: 20px 0;
+  padding: 10px;
+  border-bottom: 1px solid #eee;
+  display: flex;
+  justify-content: center;
+  gap: 10px;
+}
+
+.filter-btn {
+  padding: 8px 16px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  background: #fff;
+  color: #888;
+  font-size: 14px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.filter-btn:hover {
+  border-color: #0FC57C;
+  color: #0FC57C;
+}
+
+.filter-btn.active {
+  background: #0FC57C;
+  color: #fff;
+  border-color: #0FC57C;
+}
+
+/* Stats Panel */
+.stats-panel {
+  margin: 20px 0;
+  padding: 10px;
+  border-bottom: 1px solid #eee;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 10px;
+}
+
+.stats-panel span {
+  color: #888;
+  font-size: 14px;
+}
+
+.clear-completed {
+  padding: 8px 16px;
+  border: 1px solid #CF2323;
+  border-radius: 4px;
+  background: #fff;
+  color: #CF2323;
+  font-size: 14px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.clear-completed:hover {
+  background: #CF2323;
+  color: #fff;
+}
+
+/* Responsive Design */
+@media (max-width: 480px) {
+  .container {
+    width: 90%;
+  }
+  
+  .filter-panel {
+    flex-direction: column;
+  }
+  
+  .filter-btn {
+    width: 100%;
+  }
+  
+  .stats-panel {
+    flex-direction: column;
+    align-items: flex-start;
+  }
+  
+  .clear-completed {
+    width: 100%;
+  }
+}
 /* Heading */
 h3,
 label[for='new-task'] {
diff --git a/index.html b/index.html
index 66f032d..8daeb27 100755
--- a/index.html
+++ b/index.html
@@ -11,6 +11,20 @@
         <label for="new-task">Add Item</label><input id="new-task" type="text"><button>Add</button>
       </p>
       
+      <!-- 过滤面板 -->
+      <div class="filter-panel">
+        <button class="filter-btn active" data-filter="all">全部</button>
+        <button class="filter-btn" data-filter="active">进行中</button>
+        <button class="filter-btn" data-filter="completed">已完成</button>
+      </div>
+      
+      <!-- 统计区域 -->
+      <div class="stats-panel">
+        <span class="total-tasks">0 tasks</span>
+        <span class="completed-tasks">0 completed</span>
+        <button class="clear-completed">清除已完成</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..b8309b9 100755
--- a/js/app.js
+++ b/js/app.js
@@ -4,6 +4,69 @@ var addButton = document.getElementsByTagName("button")[0];               // Fir
 var incompleteTasksHolder = document.getElementById("incomplete-tasks");  // Incomplete-tasks
 var completedTasksHolder = document.getElementById("completed-tasks");    // Completed-tasks
 
+// Filter and Stats Elements
+var filterButtons, totalTasksElement, completedTasksElement, clearCompletedButton, currentFilter;
+
+// Initialize elements after DOM is loaded
+document.addEventListener('DOMContentLoaded', function() {
+  filterButtons = document.querySelectorAll(".filter-btn");
+  totalTasksElement = document.querySelector(".total-tasks");
+  completedTasksElement = document.querySelector(".completed-tasks");
+  clearCompletedButton = document.querySelector(".clear-completed");
+  currentFilter = "all"; // Default filter
+});
+
+// localStorage data structure
+var STORAGE_KEY = "todo-list-data";
+
+// Save data to localStorage
+var saveData = function() {
+  var data = {
+    incompleteTasks: [],
+    completedTasks: []
+  };
+  
+  // Save incomplete tasks
+  for(var i = 0; i < incompleteTasksHolder.children.length; i++) {
+    var li = incompleteTasksHolder.children[i];
+    var label = li.querySelector("label");
+    data.incompleteTasks.push(label.innerText);
+  }
+  
+  // Save completed tasks
+  for(var i = 0; i < completedTasksHolder.children.length; i++) {
+    var li = completedTasksHolder.children[i];
+    var label = li.querySelector("label");
+    data.completedTasks.push(label.innerText);
+  }
+  
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
+};
+
+// Load data from localStorage
+var loadData = function() {
+  var data = localStorage.getItem(STORAGE_KEY);
+  if(data) {
+    data = JSON.parse(data);
+    
+    // Load incomplete tasks
+    data.incompleteTasks.forEach(function(taskText) {
+      var listItem = createNewTaskElement(taskText);
+      incompleteTasksHolder.appendChild(listItem);
+      bindTaskEvents(listItem, taskCompleted);
+    });
+    
+    // Load completed tasks
+    data.completedTasks.forEach(function(taskText) {
+      var listItem = createNewTaskElement(taskText);
+      var checkBox = listItem.querySelector("input[type=checkbox]");
+      checkBox.checked = true;
+      completedTasksHolder.appendChild(listItem);
+      bindTaskEvents(listItem, taskIncomplete);
+    });
+  }
+};
+
 var createNewTaskElement = function(taskString) {       // New Task List Item
   var listItem = document.createElement("li");          // Create List Item
   var checkBox = document.createElement("input");       // Input (checkbox)
@@ -47,6 +110,7 @@ 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
+      saveData(); // Save after editing
   } else {                                                      // Switch to .editMode
      editInput.value = label.innerText;                         // Input value becomes the label's text
      button.innerText = "Save";                                 // Button name modified to Save
@@ -94,4 +158,95 @@ for(var i = 0; i < incompleteTasksHolder.children.length; i++) {     // Cycle ov
 
 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
+}
+
+// Update stats
+var updateStats = function() {
+  var total = incompleteTasksHolder.children.length + completedTasksHolder.children.length;
+  var completed = completedTasksHolder.children.length;
+  var active = incompleteTasksHolder.children.length;
+  
+  totalTasksElement.textContent = total + " tasks";
+  completedTasksElement.textContent = completed + " completed";
+};
+
+// Filter tasks
+var filterTasks = function(filter) {
+  currentFilter = filter;
+  
+  // Update button active state
+  filterButtons.forEach(function(button) {
+    button.classList.remove("active");
+    if(button.getAttribute("data-filter") === filter) {
+      button.classList.add("active");
+    }
+  });
+  
+  // Show/hide task lists based on filter
+  if(filter === "all") {
+    incompleteTasksHolder.style.display = "block";
+    completedTasksHolder.style.display = "block";
+  } else if(filter === "active") {
+    incompleteTasksHolder.style.display = "block";
+    completedTasksHolder.style.display = "none";
+  } else if(filter === "completed") {
+    incompleteTasksHolder.style.display = "none";
+    completedTasksHolder.style.display = "block";
+  }
+};
+
+// Clear completed tasks
+var clearCompleted = function() {
+  while(completedTasksHolder.firstChild) {
+    completedTasksHolder.removeChild(completedTasksHolder.firstChild);
+  }
+  updateStats();
+  saveData();
+};
+
+// Event listeners
+document.addEventListener('DOMContentLoaded', function() {
+  filterButtons.forEach(function(button) {
+    button.addEventListener("click", function() {
+      var filter = this.getAttribute("data-filter");
+      filterTasks(filter);
+    });
+  });
+
+  clearCompletedButton.addEventListener("click", clearCompleted);
+});
+
+// Update stats when tasks are added, removed, or completed
+var originalAddTask = addTask;
+addTask = function() {
+  originalAddTask();
+  updateStats();
+  saveData();
+};
+
+var originalDeleteTask = deleteTask;
+deleteTask = function() {
+  originalDeleteTask.apply(this, arguments);
+  updateStats();
+  saveData();
+};
+
+var originalTaskCompleted = taskCompleted;
+taskCompleted = function() {
+  originalTaskCompleted.apply(this, arguments);
+  updateStats();
+  saveData();
+};
+
+var originalTaskIncomplete = taskIncomplete;
+taskIncomplete = function() {
+  originalTaskIncomplete.apply(this, arguments);
+  updateStats();
+  saveData();
+};
+
+// Load data from localStorage and update stats on page load
+document.addEventListener('DOMContentLoaded', function() {
+  loadData();
+  updateStats();
+});
\ No newline at end of file