diff --git a/internal/app/entity/matter_env.go b/internal/app/entity/matter_env.go
index db51050..f6a966f 100644
--- a/internal/app/entity/matter_env.go
+++ b/internal/app/entity/matter_env.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/google/uuid"
@@ -28,7 +29,7 @@ var SupportEnvs = []MatterEnv{
 	{Name: "$UUID", Intro: "UUID", Example: "6ba7b810-9dad-11d1-80b4-00c04fd430c8", builder: func(m *Matter) string { return uuid.New().String() }},
 	{Name: "$RAW_PATH", Intro: "初始上传路径", Example: "文稿/简历", builder: func(m *Matter) string { return m.Parent }},
 	{Name: "$RAW_NAME", Intro: "初始文件名", Example: "张三-简历", builder: func(m *Matter) string { return m.Name }},
-	{Name: "$RAW_EXT", Intro: "初始文件后缀", Example: "pdf", builder: func(m *Matter) string { return filepath.Ext(m.Name)[1:] }},
+	{Name: "$RAW_EXT", Intro: "初始文件后缀", Example: "pdf", builder: func(m *Matter) string { return strings.TrimPrefix(filepath.Ext(m.Name), ".") }},
 	{Name: "$RAND_8KEY", Intro: "8位随机字符", Example: "mCUoR35r", builder: func(m *Matter) string { return strutil.RandomText(8) }},
 	{Name: "$RAND_16KEY", Intro: "16位随机字符", Example: "e1CbDUNfyVP3sScJ", builder: func(m *Matter) string { return strutil.RandomText(16) }},
 	{Name: "$NOW_DATE", Intro: "当前时间-日期", Example: "20210101", builder: func(m *Matter) string { return timeutil.Format(time.Now(), "YYYYMMDD") }},