diff --git a/internal/service/material_import.go b/internal/service/material_import.go
index aa20f24f..69cc56be 100644
--- a/internal/service/material_import.go
+++ b/internal/service/material_import.go
@@ -104,12 +104,12 @@ func (s *MaterialImportService) validateRows(organizationID int64, rows []model.
 		}
 		if category.ParentID == nil {
 			for _, alias := range aliases {
-				registerCategoryAlias(majors, alias, category)
+				registerCategoryAlias(majors, normalizeWhitespace(alias), category)
 			}
 			continue
 		}
 		for _, alias := range aliases {
-			registerCategoryAlias(minors, minorCategoryKey(*category.ParentID, alias), category)
+			registerCategoryAlias(minors, minorCategoryKey(*category.ParentID, normalizeWhitespace(alias)), category)
 		}
 	}
 	unitByName := make(map[string]*model.Unit)
@@ -147,20 +147,22 @@ func (s *MaterialImportService) validateRows(organizationID int64, rows []model.
 			reasons = append(reasons, "规格超过 200 字")
 		}
 
-		major := majors[row.MajorName]
-		if row.MajorName == "" {
+		majorName := normalizeWhitespace(row.MajorName)
+		major := majors[majorName]
+		if majorName == "" {
 			reasons = append(reasons, "大类不能为空")
 		} else if major == nil {
 			reasons = append(reasons, fmt.Sprintf("大类「%s」不存在或已停用，请核对分类名称或编码", row.MajorName))
 		}
 
+		minorName := normalizeWhitespace(row.MinorName)
 		var minor *model.MaterialCategory
-		if row.MinorName == "" {
+		if minorName == "" {
 			reasons = append(reasons, "小类不能为空")
 		} else if major == nil {
 			// 大类已经报错，小类无法定位，不重复报
 		} else {
-			minor = minors[minorCategoryKey(major.ID, row.MinorName)]
+			minor = minors[minorCategoryKey(major.ID, minorName)]
 			if minor == nil {
 				reasons = append(reasons, fmt.Sprintf("小类「%s」在「%s」下不存在或已停用，请核对分类名称或编码", row.MinorName, row.MajorName))
 			}
@@ -294,6 +296,16 @@ func minorCategoryKey(majorID int64, minorName string) string {
 	return fmt.Sprintf("%d\x00%s", majorID, minorName)
 }
 
+// normalizeWhitespace 把文本里的各种空白（半角空格、全角空格 U+3000、不换行空格
+// U+00A0、制表符等）统一压成单个半角空格，并去掉首尾。
+//
+// 界面上的分类显示名是前端拼出来的「编码 + 半角空格 + 名称」，用户照抄进模板时，
+// 那个空格在中文输入法全角模式下会变成 U+3000、从网页复制偶尔带 U+00A0——两串肉眼
+// 一模一样、码点不同，不归一化就成了「浏览器复制的能导入、自己手写的报不存在」。
+func normalizeWhitespace(text string) string {
+	return strings.Join(strings.Fields(text), " ")
+}
+
 // registerCategoryAlias 把一个写法登记进分类索引。空写法忽略；键已被别的分类占用
 // 时不覆盖，保证结果不随分类的遍历顺序变化。
 func registerCategoryAlias(index map[string]*model.MaterialCategory, key string, category *model.MaterialCategory) {
diff --git a/internal/service/material_import_test.go b/internal/service/material_import_test.go
index 85b2308b..67fa8cd1 100644
--- a/internal/service/material_import_test.go
+++ b/internal/service/material_import_test.go
@@ -283,3 +283,42 @@ func TestMaterialImportServiceRejectsDisabledCategoryAliases(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// 界面上的显示名是「编码 + 半角空格 + 名称」，而中文输入法全角模式下敲出来的空格是
+// U+3000、从网页复制有时带 U+00A0。两串肉眼完全一样、码点不同，不归一化就会变成
+// 「从浏览器复制的能导入、自己手写的报不存在」。
+func TestMaterialImportServiceAcceptsWhitespaceVariantsInCategoryNames(t *testing.T) {
+	cases := []struct {
+		name  string
+		major string
+		minor string
+	}{
+		{"全角空格 U+3000", "A　机械结构类", "A01　标准件"},
+		{"不换行空格 U+00A0", "A 机械结构类", "A01 标准件"},
+		{"连续半角空格", "A  机械结构类", "A01  标准件"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			mock, cleanup := newImportServiceMock(t)
+			defer cleanup()
+
+			expectImportMasterData(mock, true)
+			expectImportPersist(mock, "A010201")
+			expectImportLog(mock, "物料.xlsx", "success", 1, 1, 0, "")
+
+			data := buildTestWorkbook(t, [][]string{
+				{"内六角螺栓", "M8x30", "个", tc.major, tc.minor},
+			})
+			result, err := NewMaterialImportService().Import(1, "tester", "物料.xlsx", bytes.NewReader(data))
+			if err != nil {
+				t.Fatalf("import: %v", err)
+			}
+			if result.SuccessRows != 1 || result.FailedRows != 0 || len(result.Errors) != 0 {
+				t.Fatalf("result = %+v", result)
+			}
+			if err := mock.ExpectationsWereMet(); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}