diff --git a/frontend/src/pages/system/sys-params/index.less b/frontend/src/pages/system/sys-params/index.less
index 32cb1b2..b08db60 100644
--- a/frontend/src/pages/system/sys-params/index.less
+++ b/frontend/src/pages/system/sys-params/index.less
@@ -74,22 +74,64 @@
   line-height: 1.6;
 }
 
-.param-value-rich-editor {
+.param-value-rich-editor-shell {
+  position: relative;
+  min-height: var(--param-value-editor-min-height);
+  max-height: 260px;
+}
+
+.param-value-rich-editor,
+.param-value-rich-editor-highlight {
+  box-sizing: border-box;
   min-height: var(--param-value-editor-min-height);
   max-height: 260px;
   padding: 6px 11px;
-  overflow: auto;
-  border: 1px solid #d9d9d9;
-  border-radius: 6px;
-  background: #fff;
-  color: rgba(0, 0, 0, 0.88);
   font-family: 'SFMono-Regular', Consolas, Menlo, monospace;
   font-size: 14px;
   line-height: 1.5715;
-  outline: none;
   white-space: pre-wrap;
   word-break: break-word;
+}
+
+.param-value-rich-editor-highlight {
+  position: absolute;
+  inset: 0;
+  overflow: hidden;
+  border: 1px solid transparent;
+  border-radius: 6px;
+  background: #fff;
+  color: rgba(0, 0, 0, 0.88);
+  pointer-events: none;
+}
+
+.param-value-rich-editor-highlight .param-value-template-token {
+  margin: 0 2px;
+  vertical-align: 1px;
+}
+
+.param-value-rich-editor {
+  position: relative;
+  z-index: 1;
+  overflow: auto;
+  border: 1px solid #d9d9d9;
+  border-radius: 6px;
+  background: transparent !important;
+  color: transparent !important;
+  caret-color: rgba(0, 0, 0, 0.88);
+  outline: none;
   transition: border-color 0.2s, box-shadow 0.2s;
+  -webkit-text-fill-color: transparent;
+}
+
+.param-value-rich-editor::placeholder {
+  color: rgba(0, 0, 0, 0.25);
+  -webkit-text-fill-color: rgba(0, 0, 0, 0.25);
+}
+
+.param-value-rich-editor::selection {
+  background: #bae0ff;
+  color: rgba(0, 0, 0, 0.88);
+  -webkit-text-fill-color: rgba(0, 0, 0, 0.88);
 }
 
 .param-value-rich-editor:hover {
@@ -101,16 +143,6 @@
   box-shadow: 0 0 0 2px rgba(5, 145, 255, 0.1);
 }
 
-.param-value-rich-editor:empty::before {
-  color: rgba(0, 0, 0, 0.25);
-  content: attr(data-placeholder);
-}
-
-.param-value-rich-editor .param-value-template-token {
-  margin: 0 2px;
-  vertical-align: 1px;
-}
-
 .param-boolean-segmented {
   width: 176px;
   padding: 2px;
diff --git a/frontend/src/pages/system/sys-params/index.tsx b/frontend/src/pages/system/sys-params/index.tsx
index cd2334c..0e82652 100644
--- a/frontend/src/pages/system/sys-params/index.tsx
+++ b/frontend/src/pages/system/sys-params/index.tsx
@@ -1,5 +1,5 @@
 import { Button, Col, Drawer, Form, Input, Popconfirm, Popover, Row, Segmented, Select, Space, Switch, Tag, Tooltip, Typography, message } from "antd";
-import { type CSSProperties, type ReactNode, useCallback, useEffect, useLayoutEffect, useRef, useState } from "react";
+import { type ChangeEvent, type CSSProperties, type ReactNode, type UIEvent, useCallback, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { DeleteOutlined, EditOutlined, InfoCircleOutlined, PlusOutlined, SearchOutlined, SettingOutlined } from "@ant-design/icons";
 import { createParam, deleteParam, pageParams, updateParam } from "@/api";
@@ -54,49 +54,6 @@ const renderTemplateParamSegments = (text: string) => {
   return segments;
 };
 
-const readEditorText = (element: HTMLElement) => element.innerText.replace(/\r\n/g, "\n");
-
-const getCaretTextOffset = (element: HTMLElement) => {
-  const selection = window.getSelection();
-  if (!selection || selection.rangeCount === 0 || !selection.anchorNode || !element.contains(selection.anchorNode)) {
-    return null;
-  }
-
-  const range = selection.getRangeAt(0);
-  const prefixRange = range.cloneRange();
-  prefixRange.selectNodeContents(element);
-  prefixRange.setEnd(range.endContainer, range.endOffset);
-  return prefixRange.toString().length;
-};
-
-const restoreCaretTextOffset = (element: HTMLElement, offset: number) => {
-  const selection = window.getSelection();
-  if (!selection) return;
-
-  const range = document.createRange();
-  const walker = document.createTreeWalker(element, NodeFilter.SHOW_TEXT);
-  let remaining = offset;
-  let node = walker.nextNode();
-
-  while (node) {
-    const textLength = node.textContent?.length ?? 0;
-    if (remaining <= textLength) {
-      range.setStart(node, remaining);
-      range.collapse(true);
-      selection.removeAllRanges();
-      selection.addRange(range);
-      return;
-    }
-    remaining -= textLength;
-    node = walker.nextNode();
-  }
-
-  range.selectNodeContents(element);
-  range.collapse(false);
-  selection.removeAllRanges();
-  selection.addRange(range);
-};
-
 function TemplateParamValueEditor({
   value,
   onChange,
@@ -112,52 +69,43 @@ function TemplateParamValueEditor({
   placeholder?: string;
   rows?: number;
 }) {
-  const editorRef = useRef<HTMLDivElement>(null);
-  const pendingCaretOffsetRef = useRef<number | null>(null);
+  const highlightRef = useRef<HTMLDivElement>(null);
   const text = value === undefined || value === null ? "" : String(value);
   const editorStyle = { "--param-value-editor-min-height": `${rows * 22 + 20}px` } as CSSProperties;
 
-  useLayoutEffect(() => {
-    const editor = editorRef.current;
-    const caretOffset = pendingCaretOffsetRef.current;
-    if (!editor || caretOffset === null || document.activeElement !== editor) {
-      return;
-    }
-
-    restoreCaretTextOffset(editor, caretOffset);
-    pendingCaretOffsetRef.current = null;
-  }, [text]);
-
-  const handleInput = () => {
-    const editor = editorRef.current;
-    if (!editor) return;
-
-    pendingCaretOffsetRef.current = getCaretTextOffset(editor);
-    const nextValue = readEditorText(editor);
+  const handleChange = (event: ChangeEvent<HTMLTextAreaElement>) => {
+    const nextValue = event.target.value;
     onChange?.(nextValue);
     onTextChange?.(nextValue);
   };
 
+  const handleScroll = (event: UIEvent<HTMLTextAreaElement>) => {
+    if (!highlightRef.current) return;
+
+    highlightRef.current.scrollTop = event.currentTarget.scrollTop;
+    highlightRef.current.scrollLeft = event.currentTarget.scrollLeft;
+  };
+
   return (
-    <div
-      ref={editorRef}
-      className="param-value-rich-editor"
-      contentEditable
-      data-placeholder={placeholder}
-      role="textbox"
-      aria-multiline="true"
-      spellCheck={false}
-      style={editorStyle}
-      suppressContentEditableWarning
-      tabIndex={0}
-      onFocus={onFocus}
-      onInput={handleInput}
-      onPaste={(event) => {
-        event.preventDefault();
-        document.execCommand("insertText", false, event.clipboardData.getData("text/plain"));
-      }}
-    >
-      {text ? renderTemplateParamSegments(text) : null}
+    <div className="param-value-rich-editor-shell" style={editorStyle}>
+      <div ref={highlightRef} className="param-value-rich-editor-highlight" aria-hidden>
+        {text ? (
+          <>
+            {renderTemplateParamSegments(text)}
+            <span className="param-value-editor-tail"> </span>
+          </>
+        ) : null}
+      </div>
+      <Input.TextArea
+        className="param-value-rich-editor"
+        value={text}
+        placeholder={placeholder}
+        rows={rows}
+        spellCheck={false}
+        onFocus={onFocus}
+        onChange={handleChange}
+        onScroll={handleScroll}
+      />
     </div>
   );
 }