diff --git a/CHANGELOG.md b/CHANGELOG.md
index 547c70edb..4925284f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -81,6 +81,7 @@
 
 ### v3.5.2 / 2020-09-xx
 
+* [744](https://github.com/Vanessa219/vditor/issues/744) IR 模式代码块闪烁 `修复缺陷`
 * [748](https://github.com/Vanessa219/vditor/issues/748) 数学公式中出现中文不能渲染问题 `修复缺陷`
 * [738](https://github.com/Vanessa219/vditor/issues/738) IR 模式标题变大变小快捷键及光标位置 `修复缺陷`
 * [736](https://github.com/Vanessa219/vditor/issues/736) MathJax 数学公式会抖动 `改进功能`
diff --git a/src/ts/ir/index.ts b/src/ts/ir/index.ts
index feb8744b6..4a54233f8 100644
--- a/src/ts/ir/index.ts
+++ b/src/ts/ir/index.ts
@@ -90,7 +90,7 @@ class IR {
             if (this.composingLock) {
                 return;
             }
-            input(vditor, getSelection().getRangeAt(0).cloneRange());
+            input(vditor, getSelection().getRangeAt(0).cloneRange(), false, event);
         });
 
         this.element.addEventListener("click", (event: MouseEvent & { target: HTMLInputElement }) => {
diff --git a/src/ts/ir/input.ts b/src/ts/ir/input.ts
index d31474c61..68d045e45 100644
--- a/src/ts/ir/input.ts
+++ b/src/ts/ir/input.ts
@@ -9,8 +9,9 @@ import {log} from "../util/log";
 import {processCodeRender} from "../util/processCode";
 import {getSelectPosition, setRangeByWbr} from "../util/selection";
 import {processAfterRender} from "./process";
+import {Constants} from "../constants";
 
-export const input = (vditor: IVditor, range: Range, ignoreSpace = false) => {
+export const input = (vditor: IVditor, range: Range, ignoreSpace = false, event?: InputEvent) => {
     let blockElement = hasClosestBlock(range.startContainer);
     // 前后可以输入空格
     if (blockElement && !ignoreSpace && blockElement.getAttribute("data-type") !== "code-block") {
@@ -132,7 +133,9 @@ export const input = (vditor: IVditor, range: Range, ignoreSpace = false) => {
             }
             // firefox 列表回车不会产生新的 list item https://github.com/Vanessa219/vditor/issues/194
             html = html.replace("<div><wbr><br></div>", "<li><p><wbr><br></p></li>");
-        } else if (blockElement.previousElementSibling && blockElement.previousElementSibling.textContent !== "") {
+        } else if (blockElement.previousElementSibling &&
+            blockElement.previousElementSibling.textContent.replace(Constants.ZWSP, "") !== "" &&
+            event && event.inputType === "insertParagraph") {
             // 换行时需要处理上一段落
             html = blockElement.previousElementSibling.outerHTML + html;
             blockElement.previousElementSibling.remove();