diff --git a/generic-release.spec b/generic-release.spec
index 29ff6112cba1a39d42038fc63051ef0a9526b6d0..a6a93da0e6483a2205d2ad1b93af5fafb568551c 100644
--- a/generic-release.spec
+++ b/generic-release.spec
@@ -6,7 +6,7 @@
 %define generic_version 20.03
 %define generic_patch_level LTS
 %define generic_patch_level_extend SP3
-%define generic_release 49
+%define generic_release 50
 %define builtin_release_version 1.0
 
 %define current_arch %{_arch}
@@ -14,6 +14,8 @@
 %define current_arch x86
 %endif
 
+%global boot_args fpi_to_tail=off
+
 Name:		%{product_family}-release
 Version:	%{generic_version}%{generic_patch_level}_%{generic_patch_level_extend}
 Release:	%{generic_release}
@@ -70,23 +72,23 @@ openeuler-release-custom
 %prep
 %setup -q -n generic-release-%{builtin_release_version}
 
+%postun -n %{product_family}-release-custom
+grep "%{boot_args}" /etc/grub.d/10_linux > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+echo "ERROR: failed to clean up boot args in /etc/grub.d/10_linux because they have been modified"
+exit 1
+fi
+sed -i "s/%{boot_args} //g" /etc/grub.d/10_linux 
+
 %posttrans -n %{product_family}-release-custom	
 
 # parameters for grub2
-array="rd.shell=0 fpi_to_tail=off" 
+
 vendorid=`lscpu | grep "Vendor ID:" | awk '{print $3}'`
 model=`lscpu | grep "Model:" | awk '{print $2}'`
 
-if [ "0x70" == "${vendorid}" -a "3" == "${model}" ]; then
-    cmdline=`grep GRUB_CMDLINE_LINUX= /etc/default/grub | awk -F\" '{print $2}'`
-    for var in ${array[@]}
-    do
-        echo ${cmdline} | grep -q -w "${var}"
-        if [ $? -ne 0 ]; then
-            cmdline+=" ${var}"
-        fi
-    done
-    sed -i "s#GRUB_CMDLINE_LINUX=.*#GRUB_CMDLINE_LINUX=\"${cmdline}\"#g" /etc/default/grub
+if [ "0x70" == "${vendorid}" -a "3" == "${model}" ]; then 
+    sed -i "s/ ro .*args/ ro %{boot_args} \$\{args/g" /etc/grub.d/10_linux
 fi
 
 %build
@@ -200,6 +202,9 @@ rm -rf $RPM_BUILD_ROOT
 %files -n %{product_family}-release-custom
 
 %changelog
+* Tue Dec 31 2021 chemingdao <chemingdao@huawei.com> - 1.0-50
+- Bugfix: openenEuler-release-custom dnf error when openEuler installing.
+
 * Tue Dec 31 2021 chemingdao <chemingdao@huawei.com> - 1.0-49
 - init openeuler custom