First, you must have done a root on the target phone, if still not rooted then you can read the article, how to root the phone china easily HERE.
Second, your mobile phone must be installed CWM recovery, if not you can read HERE.
Third, download the ROM xperia HERE, then after the download is complete,
place the xperia ROM on the sdcard and do not enter into the folder.
Fourth, reboot into CWM recovery menu, you can do it by :
1. Turn off HP, press the power button and volume up simultaneously and
hold until the boot selection menu appears on the HP, then select recovery.
2. Delete user data, cache partititon and Dalvik cache.
3. Select install.zip from sd card, select the ROM xperia.zip who have downloaded earlier, and
select install.
Wait until the process is completed and enjoy Lenovo A316i, with a sense of the Sony Xperia ;)
Look this Screenshot :
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