diff --git a/App/Constants.cs b/App/Constants.cs
index 563a0b2..c6be5d1 100644
--- a/App/Constants.cs
+++ b/App/Constants.cs
@@ -233,13 +233,17 @@ namespace PDFPatcher
 		internal const string PageLabels = "页码样式";
 		internal static class PageLabelStyles
 		{
-			internal static readonly string[] Names = { "数字", "大写罗马数字", "小写罗马数字", "大写英文字母", "小写英文字母" };
-			internal static readonly char[] PdfValues = { 'D', 'R', 'r', 'A', 'a' };
-			internal static readonly char[] SimpleInfoIdentifiers = { '0', 'I', 'i', 'A', 'a' };
-			internal static readonly int[] Values = { PdfPageLabels.DECIMAL_ARABIC_NUMERALS,
-											 PdfPageLabels.UPPERCASE_ROMAN_NUMERALS, PdfPageLabels.LOWERCASE_ROMAN_NUMERALS,
-											 PdfPageLabels.UPPERCASE_LETTERS, PdfPageLabels.LOWERCASE_LETTERS
-										 };
+			internal static readonly string[] Names = { "数字", "大写罗马数字", "小写罗马数字", "大写英文字母", "小写英文字母", "无" };
+			internal static readonly char[] PdfValues = { 'D', 'R', 'r', 'A', 'a', '-' };
+			internal static readonly char[] SimpleInfoIdentifiers = { '0', 'I', 'i', 'A', 'a', '-' };
+			internal static readonly int[] Values = {
+				PdfPageLabels.DECIMAL_ARABIC_NUMERALS,
+				PdfPageLabels.UPPERCASE_ROMAN_NUMERALS,
+				PdfPageLabels.LOWERCASE_ROMAN_NUMERALS,
+				PdfPageLabels.UPPERCASE_LETTERS,
+				PdfPageLabels.LOWERCASE_LETTERS,
+				PdfPageLabels.EMPTY,
+			};
 		}
 		internal static class PageLabelsAttributes
 		{
diff --git a/App/Functions/Editor/InsertPageLabelForm.cs b/App/Functions/Editor/InsertPageLabelForm.cs
index 6e1b565..4e367cf 100644
--- a/App/Functions/Editor/InsertPageLabelForm.cs
+++ b/App/Functions/Editor/InsertPageLabelForm.cs
@@ -15,9 +15,6 @@ namespace PDFPatcher.Functions
 
 		public InsertPageLabelForm() {
 			InitializeComponent();
-			this.OnFirstLoad(OnLoad);
-		}
-		void OnLoad() {
 			_NumericStyleBox.AddRange(Constants.PageLabelStyles.Names).Select(0);
 			_RemoveLabelButton.Enabled = false;
 		}
diff --git a/App/Processor/Mupdf/PageLabelCollection.cs b/App/Processor/Mupdf/PageLabelCollection.cs
index 78d6e79..24b523a 100644
--- a/App/Processor/Mupdf/PageLabelCollection.cs
+++ b/App/Processor/Mupdf/PageLabelCollection.cs
@@ -20,7 +20,7 @@ namespace MuPdfSharp
 					var sp = d["St"].IntegerValue;
 					var p = d["P"].StringValue;
 					var s = d["S"].NameValue;
-					pl.Add(new PageLabel(n, sp, p, s.Length == 0 ? PageLabelStyle.Digit : (PageLabelStyle)(byte)s[0]));
+					pl.Add(new PageLabel(n, sp, p, s.Length == 0 ? PageLabelStyle.Default : (PageLabelStyle)(byte)s[0]));
 				}
 				pl.Sort();
 			}
diff --git a/App/Processor/Mupdf/Structures.cs b/App/Processor/Mupdf/Structures.cs
index 90ad62a..b71145e 100644
--- a/App/Processor/Mupdf/Structures.cs
+++ b/App/Processor/Mupdf/Structures.cs
@@ -87,16 +87,17 @@ namespace MuPdfSharp
 			var n = pageNumber - FromPageNumber + (StartAt < 1 ? 0 : StartAt - 1);
 			switch (NumericStyle) {
 				case PageLabelStyle.Default:
+					return Prefix;
 				case PageLabelStyle.Digit:
 					return String.Concat(Prefix, n.ToText());
 				case PageLabelStyle.UpperRoman:
-					return String.Concat(Prefix, ValueHelper.ToRoman(n));
+					return String.Concat(Prefix, n.ToRoman());
 				case PageLabelStyle.LowerRoman:
-					return String.Concat(Prefix, ValueHelper.ToRoman(n)).ToLowerInvariant();
+					return String.Concat(Prefix, n.ToRoman()).ToLowerInvariant();
 				case PageLabelStyle.UpperAlphabetic:
-					return String.Concat(Prefix, ValueHelper.ToAlphabet(n, true));
+					return String.Concat(Prefix, n.ToAlphabet(true));
 				case PageLabelStyle.LowerAlphabetic:
-					return String.Concat(Prefix, ValueHelper.ToAlphabet(n, false));
+					return String.Concat(Prefix, n.ToAlphabet(false));
 				default:
 					goto case PageLabelStyle.Digit;
 			}
@@ -105,7 +106,7 @@ namespace MuPdfSharp
 
 	public enum PageLabelStyle : byte
 	{
-		Default = 0,
+		Default = (byte)'-',
 		Digit = (byte)'d',
 		UpperRoman = (byte)'R',
 		LowerRoman = (byte)'r',
diff --git a/更新历史.txt b/更新历史.txt
index 8fd09f2..7aff74e 100644
--- a/更新历史.txt
+++ b/更新历史.txt
@@ -53,6 +53,7 @@
 	尝试复制识别失败页面文本时会导致程序崩溃。
 	生成书签功能“添加字体筛选条件”对话框在信息文件没有包含字体信息时会导致程序崩溃。
 	当主程序界面窗口显示不完整时切换功能页面时界面会冻结。
+	编辑器不支持空白页码标签。
 
 0.6.2.0 2021年11月9日
 新增功能：