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input t-code:SMLT.
Find the language alreadey installed in system.
input t-code:se38, input RSCPINST in program textbox area.
select Chinese , click Activate.
click Yes.
if show below windows ,it means Chinese language has been actived.
log on again, will find interface are all Chinese.
If you not click Activate button, then system will show below error.
other solution is :edit server\usr\sap\lei\prfile\lei_dvebmgsoo_hangyc.txt配置文件，把如下的内容复制过去也可以的。
SAPSYSTEMNAME=LEI
INSTANCE_NAME=DVEBMGS00
SAPSYSTEM=00
rdisp/wp_no_dia=6
rdisp/wp_no_btc=2
rdisp/wp_no_vb=5
rdisp/wp_no_vb2=2
rdisp/wp_no_enq=1
rdisp/wp_no_spo=1
SAPGLOBALHOST=hangyc
PHYS_MEMSIZE=2400
DIR_TRANS=C:\usr\sap\trans
icm/server_port_0=PROT=HTTP,PORT=8000,EXTBIND=1
DIR_ORAHOME=C:\oracle\ora92
install/collate/active 0
zcsa/installed_languages = 1EJDM
install/codepage/appl_server = 8400
install/codepage/appl_server = 8000
install/codepage/appl_server = 8300
install/codepage/appl_server = 1100
install/codepage/db/non_transp = 8400
install/codepage/db/non_transp = 8000
install/codepage/db/non_transp = 8300
install/codepage/db/non_transp = 1100
install/codepage/db/transp = 8400
install/codepage/db/transp = 8000
install/codepage/db/transp = 8300
install/codepage/db/transp = 1100
