diff --git a/src/lib/lang/ja/help_ja.md b/src/lib/lang/ja/help_ja.md
index 353bf9363..205f1d0a0 100644
--- a/src/lib/lang/ja/help_ja.md
+++ b/src/lib/lang/ja/help_ja.md
@@ -1,6 +1,6 @@
-@[toc](Catalog)
+@[toc](目次)
 
-Markdown Guide
+Markdown 文法ガイド
 ===
 > Detailed: [http://commonmark.org/help/](http://commonmark.org/help/)
 
@@ -9,10 +9,10 @@ Markdown Guide
 **太字**
 __太字__
 ```
-## *イタリック*
+## *斜体*
 ```
-*イタリック*
-_イタリック_
+*斜体*
+_斜体_
 ```
 ## 見出し
 ```
@@ -33,7 +33,7 @@ h2
 ---
 ```
 ****
-## ^上付き^文字 & ~添~文
+## ^上付き^文字 & ~下付き~文字
 ```
 super x^2^
 sub H~2~0
@@ -43,7 +43,7 @@ sub H~2~0
 ++underline++
 ~~strikethrough~~
 ```
-## ==マーク==
+## ==蛍光ペン==
 ```
 ==mark==
 ```
@@ -58,13 +58,13 @@ sub H~2~0
 
 ## リスト
 ```
-ol
+番号付きリスト
 1.
 2.
 3.
 ...
 
-ul
+箇条書きリスト
 -
 -
 ...
@@ -115,6 +115,7 @@ int main()
 | :--  | :--: | ----: |
 | left | center | right |
 | ---------------------- | ------------- | ----------------- |
+
 ## 脚注
 ```
 hello[^hello]
@@ -125,7 +126,7 @@ Look at the bottom[^hello]
 [^hello]: footnote
 
 ## 絵文字
-Detailed: [https://www.webpagefx.com/tools/emoji-cheat-sheet/](https://www.webpagefx.com/tools/emoji-cheat-sheet/)
+> Detailed: [https://www.webpagefx.com/tools/emoji-cheat-sheet/](https://www.webpagefx.com/tools/emoji-cheat-sheet/)
 ```
 :laughing:
 :blush:
@@ -135,12 +136,12 @@ Detailed: [https://www.webpagefx.com/tools/emoji-cheat-sheet/](https://www.webpa
 ```
 :laughing::blush::smiley::)
 
-## $\KaTeX$ Mathematics
+## $\KaTeX$ 数式
+> Detailed: [KaTeXマニュアル](http://www.intmath.com/cg5/katex-mathjax-comparison.php)、[KaTeX function](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX)、[LaTeXマニュアル](https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference)
 
-We can render formulas for example：$x_i + y_i = z_i$ and $\sum_{i=1}^n a_i=0$
+We can render formulas for example：$x_i + y_i = z_i$ and $\sum_{i=1}^n a_i=0$  
 We can also single-line rendering
 $$\sum_{i=1}^n a_i=0$$
-Detailed: [katex](http://www.intmath.com/cg5/katex-mathjax-comparison.php)和[katex function](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX)以及[latex](https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference)
 
 ## レイアウト
 
@@ -162,7 +163,7 @@ Detailed: [katex](http://www.intmath.com/cg5/katex-mathjax-comparison.php)和[ka
 `:::`
 :::
 
-## deflist
+## 定義リスト
 
 Term 1
 
diff --git a/src/lib/lang/ja/words_ja.json b/src/lib/lang/ja/words_ja.json
index 6a6b750c1..2146aa4f8 100644
--- a/src/lib/lang/ja/words_ja.json
+++ b/src/lib/lang/ja/words_ja.json
@@ -1,54 +1,54 @@
 {
-  "start_editor": "編集を始てね！",
+  "start_editor": "編集を始めてね！",
   "navigation_title": "ナビゲーション",
   "tl_bold": "太字",
-  "tl_italic": "イタリック",
+  "tl_italic": "斜体",
   "tl_header": "見出し",
   "tl_header_one": "見出し1",
   "tl_header_two": "見出し2",
   "tl_header_three": "見出し3",
   "tl_header_four": "見出し4",
   "tl_header_five": "見出し5",
-  "tl_header_six": "見出 6",
+  "tl_header_six": "見出し6",
   "tl_underline": "下線",
   "tl_strikethrough": "取り消し線",
-  "tl_mark": "マーク",
+  "tl_mark": "蛍光ペン",
   "tl_superscript": "上付き文字",
-  "tl_subscript": "添字",
+  "tl_subscript": "下付き文字",
   "tl_quote": "引用",
-  "tl_ol": "Ol",
-  "tl_ul": "Ul",
+  "tl_ol": "番号付きリスト",
+  "tl_ul": "箇条書きリスト",
   "tl_link": "ハイパーリンク",
   "tl_image": "画像のリンク",
-  "tl_code": "コード",
-  "tl_table": "テーブル",
+  "tl_code": "コードの挿入",
+  "tl_table": "表の挿入",
   "tl_undo": "戻る",
   "tl_redo": "進む",
-  "tl_trash": "消去",
+  "tl_trash": "削除",
   "tl_save": "保存",
-  "tl_navigation_on": "ナビゲーションオン",
-  "tl_navigation_off": "ナビゲーションオフ",
+  "tl_navigation_on": "ナビゲーションを表示",
+  "tl_navigation_off": "ナビゲーションを非表示",
   "tl_preview": "プレビュー",
-  "tl_aligncenter": "真ん中のテキスト",
-  "tl_alignleft": "テキストを左に固定",
-  "tl_alignright": "テキストを右に固定",
+  "tl_aligncenter": "中央揃え",
+  "tl_alignleft": "左揃え",
+  "tl_alignright": "右揃え",
   "tl_edit": "編集",
   "tl_single_column": "一列",
   "tl_double_column": "二列",
-  "tl_fullscreen_on": "フルスクリーンオン",
-  "tl_fullscreen_off": "フルスクリーンオフ",
+  "tl_fullscreen_on": "全画面表示",
+  "tl_fullscreen_off": "全画面表示の終了",
   "tl_read": "モデルの読み込み",
-  "tl_html_on": "HTML ON",
-  "tl_html_off": "HTML OFF",
+  "tl_html_on": "HTMLで表示",
+  "tl_html_off": "HTML表示の終了",
   "tl_help": "ヘルプ",
   "tl_upload": "画像をアップロード",
-  "tl_upload_remove": "削除",
+  "tl_upload_remove": "画像の削除",
   "tl_popup_link_title": "リンクの追加",
-  "tl_popup_link_text": "テキストのリンク",
-  "tl_popup_link_addr": "アドレスのリンク",
+  "tl_popup_link_text": "リンクテキスト",
+  "tl_popup_link_addr": "リンク先のURL",
   "tl_popup_img_link_title": "画像の追加",
-  "tl_popup_img_link_text": "画像の名前",
-  "tl_popup_img_link_addr": "画像のアドレス",
+  "tl_popup_img_link_text": "画像タイトル",
+  "tl_popup_img_link_addr": "画像URL",
   "tl_popup_link_sure": "OK",
   "tl_popup_link_cancel": "戻る"
 }