diff --git a/backport-bash-completion-add-systemctl-service-log-level-target.patch b/backport-bash-completion-add-systemctl-service-log-level-target.patch
new file mode 100644
index 0000000000000000000000000000000000000000..17cea61dbc2c111964d6fee1f35dea34e6aaad76
--- /dev/null
+++ b/backport-bash-completion-add-systemctl-service-log-level-target.patch
@@ -0,0 +1,46 @@
+From 8bfc0e2d5ca09985900e8a2494b797f3086e9649 Mon Sep 17 00:00:00 2001
+From: Luca Boccassi <bluca@debian.org>
+Date: Wed, 27 Dec 2023 16:59:03 +0100
+Subject: [PATCH] bash completion: add systemctl service-log-level/target
+
+(cherry picked from commit 79272d3098597686d9e796bd946ea272304fd720)
+---
+ shell-completion/bash/systemctl.in | 18 ++++++++++++++++++
+ 1 file changed, 18 insertions(+)
+
+diff --git a/shell-completion/bash/systemctl.in b/shell-completion/bash/systemctl.in
+index 03c3b701504..ef8cd8f4be2 100644
+--- a/shell-completion/bash/systemctl.in
++++ b/shell-completion/bash/systemctl.in
+@@ -236,6 +236,8 @@ _systemctl () {
+         [MACHINES]='list-machines'
+         [LOG_LEVEL]='log-level'
+         [LOG_TARGET]='log-target'
++        [SERVICE_LOG_LEVEL]='service-log-level'
++        [SERVICE_LOG_TARGET]='service-log-target'
+         [SERVICE_WATCHDOGS]='service-watchdogs'
+     )
+ 
+@@ -365,6 +367,22 @@ _systemctl () {
+         comps='debug info notice warning err crit alert emerg'
+     elif __contains_word "$verb" ${VERBS[LOG_TARGET]}; then
+         comps='console journal kmsg journal-or-kmsg null'
++    elif __contains_word "$verb" ${VERBS[SERVICE_LOG_LEVEL]}; then
++        if __contains_word "$prev" ${VERBS[SERVICE_LOG_LEVEL]}; then
++            comps=$( __get_all_unit_files $mode "$cur" )
++        elif __contains_word "$prev" debug info notice warning err crit alert emerg; then
++            return 0
++        else
++            comps='debug info notice warning err crit alert emerg'
++        fi
++    elif __contains_word "$verb" ${VERBS[SERVICE_LOG_TARGET]}; then
++        if __contains_word "$prev" ${VERBS[SERVICE_LOG_TARGET]}; then
++            comps=$( __get_all_unit_files $mode "$cur" )
++        elif __contains_word "$prev" console journal kmsg journal-or-kmsg null; then
++            return 0
++        else
++            comps='console journal kmsg journal-or-kmsg null'
++        fi
+     elif __contains_word "$verb" ${VERBS[SERVICE_WATCHDOGS]}; then
+         comps='on off'
+     fi
diff --git a/systemd.spec b/systemd.spec
index cb1626301b568cfe6ed350fbfc7dd0a925aea40c..bb91a9f9f155aa5bbbcfb91fe82e77578391fee2 100644
--- a/systemd.spec
+++ b/systemd.spec
@@ -25,7 +25,7 @@
 Name:           systemd
 Url:            https://systemd.io/
 Version:        255
-Release:        14
+Release:        15
 License:        MIT and LGPLv2+ and GPLv2+
 Summary:        System and Service Manager
 
@@ -64,6 +64,7 @@ Patch6010:      backport-user-util-validate-the-right-field.patch
 Patch6011:      backport-fix-conf-parser-oom-check-issue.patch
 Patch6012:      backport-unit-check-for-correct-function-in-vtable.patch
 Patch6013:      backport-fix-homed-log-message-typo-error.patch
+Patch6014:      backport-bash-completion-add-systemctl-service-log-level-target.patch
 
 Patch9008:      update-rtc-with-system-clock-when-shutdown.patch
 Patch9009:      udev-add-actions-while-rename-netif-failed.patch
@@ -1643,6 +1644,9 @@ fi
 %{_libdir}/security/pam_systemd_loadkey.so
 
 %changelog
+* Thu May 9 2024 Han Jinpeng <hanjinpeng@kylinos.cn> - 255-15
+- Add bash completion for systemctl service-log-level/target
+
 * Wed May 8 2024 Han Jinpeng <hanjinpeng@kylinos.cn> - 255-14
 - backport: sync patches from systemd community
   add backport-fix-conf-parser-oom-check-issue.patch