diff --git a/app/static/js/fillword.js b/app/static/js/fillword.js
index b967633..bd5d5a2 100644
--- a/app/static/js/fillword.js
+++ b/app/static/js/fillword.js
@@ -9,8 +9,12 @@ function fillInWord() {
     let word = getWord();
     if (isRead) Reader.read(word, inputSlider.value);
     if (!isChoose) return;
-    const element = document.getElementById("selected-words");
-    element.value = element.value + " " + word;
+    let element = document.getElementById("selected-words");
+    let index = (String)(element.value).indexOf(word);
+    localStorage.setItem("nowWord",element.value);
+    if(index === -1){
+        element.value = element.value + " " + word;
+    }
 }
 
 document.getElementById("text-content").addEventListener("click", fillInWord, false);
diff --git a/app/static/js/highlight.js b/app/static/js/highlight.js
index 0cea31a..3070d43 100644
--- a/app/static/js/highlight.js
+++ b/app/static/js/highlight.js
@@ -33,6 +33,22 @@ function highLight() {
         allWords = pickedWords.value + " ";
     }
     const list = allWords.split(" ");//将所有的生词放入一个list中，用于后续处理
+    //判断获取的单词不能为空
+    if(word != null && word != "" && word != " "){
+        let articleContent_fb2 = articleContent;
+        if(localStorage.getItem("nowWord").indexOf(word) != -1){
+            while(articleContent_fb2.toLowerCase().indexOf(word.toLowerCase()) != -1){
+                // 找到副本中和list[i]匹配的第一个单词(第一种匹配情况),并赋值给list[i]。
+                const index = articleContent_fb2.toLowerCase().indexOf(word.toLowerCase());
+                word = articleContent_fb2.substring(index, index + word.length);
+                articleContent_fb2 = articleContent_fb2.substring(index + word.length);    // 使用副本中list[i]之后的子串替换掉副本
+                articleContent = articleContent.replace(new RegExp("<mark>"+word+"</mark>", "g"), word)
+            }
+            pickedWords.value = localStorage.getItem("nowWord").replace(word,"");
+            document.getElementById("article").innerHTML = articleContent;
+            return;
+        }
+    }
     for (let i = 0; i < list.length; ++i) {
         list[i] = list[i].replace(/(^\s*)|(\s*$)/g, ""); //消除单词两边的空字符
         list[i] = list[i].replace('|', "");
diff --git a/app/test/test_bug545_huanghuiling.py b/app/test/test_bug545_huanghuiling.py
new file mode 100644
index 0000000..5d7f88b
--- /dev/null
+++ b/app/test/test_bug545_huanghuiling.py
@@ -0,0 +1,87 @@
+# 用于模拟read方法
+class Reader:
+    @staticmethod
+    def read(word, value):
+        print(f"Reading word '{word}' with slider value {value}")
+
+
+is_read = True
+is_choose = True
+
+
+# 模拟获取用户选中的单词
+def get_word():
+    return "selected word"
+
+
+# 模拟fillInWord函数的行为
+def fill_in_word():
+    word = get_word()
+    if is_read:
+        Reader.read(word, 5)
+    if not is_choose:
+        return
+        # 模拟selected-words元素
+    selected_words = "previous word "
+    index = selected_words.find(word)
+    print(f"Current selected words: {selected_words}")
+    # 假设的localStorage实现
+    local_storage = {}
+
+    if index == -1:
+        selected_words += word + " "
+        local_storage["nowWord"] = selected_words
+        print(f"Added word to selected words: {selected_words}")
+    else:
+        print(f"Word '{word}' is already in selected words.")
+
+        # 打印模拟的localStorage内容
+    print(f"Local storage: {local_storage}")
+
+
+# 假设的slider和rangeValue元素
+slider_value = "5×"
+input_slider_value = 5
+
+
+# 模拟slider的oninput事件
+def on_slider_input(value):
+    global slider_value
+    slider_value = str(value) + '×'
+    print(f"Slider value changed to: {slider_value}")
+
+
+# 模拟按钮点击事件来切换is_read和is_choose的值
+def on_read_click():
+    global is_read
+    is_read = not is_read
+    print(f"Reading is now {'enabled' if is_read else 'disabled'}")
+
+
+def on_choose_click():
+    global is_choose
+    is_choose = not is_choose
+    print(f"Choosing is now {'enabled' if is_choose else 'disabled'}")
+
+
+# 假设的功能测试
+def run_functional_test():
+    print("\nRunning functional test...")
+
+    # 模拟用户点击操作，调用fill_in_word函数
+    fill_in_word()
+
+    # 模拟用户移动滑块，调用on_slider_input函数
+    on_slider_input(7)
+
+    # 模拟用户点击“Read”按钮，切换is_read状态
+    on_read_click()
+    fill_in_word()  # 再次调用fill_in_word来测试is_read的变化
+
+    # 模拟用户点击“Choose”按钮，切换is_choose状态
+    on_choose_click()
+    fill_in_word()  # 再次调用fill_in_word来测试is_choose的变化
+
+
+# 运行功能测试
+run_functional_test()