diff --git a/scripts/starts/clash_modify.sh b/scripts/starts/clash_modify.sh
index 493c0e20..39f9a293 100644
--- a/scripts/starts/clash_modify.sh
+++ b/scripts/starts/clash_modify.sh
@@ -201,6 +201,25 @@ add_custom_inbounds_and_rules() {
     }
 }
 
+preserve_geodata_yaml() {
+    #保留订阅规则依赖的Geo数据设置，本地自定义同名配置优先
+    : >"$TMPDIR"/geodata_base.yaml
+    : >"$TMPDIR"/geodata.yaml
+    for char in geodata-mode geodata-loader geosite-matcher geo-auto-update geo-update-interval geox-url; do
+        awk -v key="$char" '
+            /^[^[:space:]#]/ { emit = ($0 ~ ("^" key ":")) }
+            emit { print }
+        ' "$core_config" >>"$TMPDIR"/geodata_base.yaml
+    done
+    for char in geodata-mode geodata-loader geosite-matcher geo-auto-update geo-update-interval geox-url; do
+        grep -qE "^$char:" "$CRASHDIR"/yamls/user.yaml "$CRASHDIR"/yamls/others.yaml 2>/dev/null && continue
+        awk -v key="$char" '
+            /^[^[:space:]#]/ { emit = ($0 ~ ("^" key ":")) }
+            emit { print }
+        ' "$TMPDIR"/geodata_base.yaml >>"$TMPDIR"/geodata.yaml
+    done
+}
+
 merger_yaml() {
     #mix和route模式生成rule-providers
     [ "$dns_mod" = "mix" ] || [ "$dns_mod" = "route" ] && ! grep -Eq '^[[:space:]]*cn:' "$TMPDIR"/rule-providers.yaml && ! grep -q '^rule-providers' "$CRASHDIR"/yamls/others.yaml 2>/dev/null && {
@@ -229,8 +248,9 @@ merger_yaml() {
             yaml_add="$yaml_add $TMPDIR/${char}.yaml"
         }
     done
+    preserve_geodata_yaml
     #合并完整配置文件
-    cut -c 1- "$TMPDIR"/set.yaml $yaml_dns $yaml_hosts $yaml_user $yaml_others $yaml_add >"$TMPDIR"/config.yaml
+    cut -c 1- "$TMPDIR"/set.yaml "$TMPDIR"/geodata.yaml $yaml_dns $yaml_hosts $yaml_user $yaml_others $yaml_add >"$TMPDIR"/config.yaml
 }
 
 test_yaml() {
@@ -244,7 +264,7 @@ test_yaml() {
         sed -i "/#自定义策略组开始/,/#自定义策略组结束/d" "$TMPDIR"/proxy-groups.yaml
         mv -f "$TMPDIR"/set_bak.yaml "$TMPDIR"/set.yaml >/dev/null 2>&1
         #合并基础配置文件
-        cut -c 1- "$TMPDIR"/set.yaml $yaml_dns $yaml_add >"$TMPDIR"/config.yaml
+        cut -c 1- "$TMPDIR"/set.yaml "$TMPDIR"/geodata_base.yaml $yaml_dns $yaml_add >"$TMPDIR"/config.yaml
         sed -i "/#自定义/d" "$TMPDIR"/config.yaml
     fi
 }
@@ -253,7 +273,7 @@ finalize_clash_yaml() {
     #建立软连接
     [ ""$TMPDIR"" = ""$BINDIR"" ] || ln -sf "$TMPDIR"/config.yaml "$BINDIR"/config.yaml 2>/dev/null || cp -f "$TMPDIR"/config.yaml "$BINDIR"/config.yaml
     #清理缓存
-    for char in $yaml_char set set_bak dns hosts; do
+    for char in $yaml_char set set_bak dns hosts geodata geodata_base; do
         rm -f "$TMPDIR"/${char}.yaml
     done
 }
diff --git a/tests/clash_geodata.sh b/tests/clash_geodata.sh
new file mode 100644
index 00000000..98ddda98
--- /dev/null
+++ b/tests/clash_geodata.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+# Run with sh tests/clash_geodata.sh [path/to/clash_modify.sh].
+set -e
+script=${1:-$(dirname "$0")/../scripts/starts/clash_modify.sh}
+. "$script"
+test_dir=$(mktemp -d)
+trap 'rm -rf "$test_dir"' EXIT HUP INT TERM
+
+setup() {
+    CRASHDIR="$test_dir/$1"
+    TMPDIR="$CRASHDIR/tmp"
+    BINDIR="$CRASHDIR/bin"
+    mkdir -p "$CRASHDIR/yamls" "$TMPDIR" "$BINDIR"
+    core_config="$CRASHDIR/yamls/config.yaml"
+    dns_mod=redir_host
+    yaml_char='rules proxy-groups'
+    yaml_user= yaml_others= yaml_dns= yaml_hosts=
+    printf 'mode: Rule\n' >"$TMPDIR/set.yaml"
+    printf ' - GEOSITE,GOOGLE,DIRECT\n' >"$TMPDIR/rules.yaml"
+    : >"$TMPDIR/proxy-groups.yaml"
+    cat >"$core_config" <<'EOF'
+geodata-mode: true
+geodata-loader: memconservative
+geosite-matcher: succinct
+geo-auto-update: true
+geo-update-interval: 24
+geox-url:
+  geoip: https://example.invalid/geoip.dat
+  geosite: >-
+    https://example.invalid/geosite.dat
+  mmdb: https://example.invalid/Country.mmdb
+rules:
+ - GEOSITE,GOOGLE,DIRECT
+mixed-port: 1234
+EOF
+}
+
+assert_line() {
+    grep -qFx -- "$1" "$TMPDIR/config.yaml" || {
+        echo "Missing expected line: $1" >&2
+        exit 1
+    }
+}
+
+setup inherited
+merger_yaml
+assert_line 'geodata-mode: true'
+assert_line 'geodata-loader: memconservative'
+assert_line 'geosite-matcher: succinct'
+assert_line 'geo-auto-update: true'
+assert_line 'geo-update-interval: 24'
+assert_line '    https://example.invalid/geosite.dat'
+[ "$(grep -c '^rules:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q '^mixed-port: 1234' "$TMPDIR/config.yaml"
+finalize_clash_yaml
+[ ! -e "$TMPDIR/geodata.yaml" ]
+[ ! -e "$TMPDIR/geodata_base.yaml" ]
+
+setup overrides
+printf 'geodata-mode: false\n' >"$CRASHDIR/yamls/user.yaml"
+printf 'geox-url: {geosite: https://override.invalid/geosite.dat}\n' >"$CRASHDIR/yamls/others.yaml"
+merger_yaml
+assert_line 'geodata-mode: false'
+assert_line 'geox-url: {geosite: https://override.invalid/geosite.dat}'
+[ "$(grep -c '^geodata-mode:' "$TMPDIR/config.yaml")" = 1 ]
+[ "$(grep -c '^geox-url:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q 'example.invalid' "$TMPDIR/config.yaml"
+
+# A rejected custom configuration must fall back to the subscription settings.
+printf '#!/bin/sh\nexit 1\n' >"$TMPDIR/CrashCore"
+chmod +x "$TMPDIR/CrashCore"
+logger() { :; }
+set +e
+test_yaml
+set -e
+assert_line 'geodata-mode: true'
+assert_line '    https://example.invalid/geosite.dat'
+[ "$(grep -c '^geox-url:' "$TMPDIR/config.yaml")" = 1 ]
+! grep -q 'override.invalid' "$TMPDIR/config.yaml"
+
+setup inline
+printf 'geox-url: {geosite: https://inline.invalid/geosite.dat}\ngeo-auto-update: false\n---\nmixed-port: 1234\n' >"$core_config"
+merger_yaml
+assert_line 'geox-url: {geosite: https://inline.invalid/geosite.dat}'
+assert_line 'geo-auto-update: false'
+! grep -qE '^---|^mixed-port: 1234' "$TMPDIR/config.yaml"
+
+setup absent
+printf 'rules:\n - MATCH,DIRECT\n' >"$core_config"
+merger_yaml
+! grep -qE '^geo(data|site|x|-)' "$TMPDIR/config.yaml"
+assert_line 'mode: Rule'
+echo 'PASS: inherited geodata, overrides, fallback, inline maps, cleanup and absent settings'