i cant understand why i got banned

reason was  Suspicious Stats

http://battlelog.battlefield.com/bf4/zh/battlereport/show/1/946688252706491200/914084091/

at this time i played SKS to get more DMR

using SKS accuracy just 18% only

you can see the next stage i never used hacks to play;;

https://bf4db.com/player/914084091

If that is your profile, click the blue claim button on the page I linked. Without claimed account I can not investigate.

https://bf4db.com/player/916115172

Your account too? If so, repeat the previous request on this profile too.

In that case, do you have any battlereports from before his ban that show you two playing together?

http://battlelog.battlefield.com/bf4/zh/battlereport/show/1/946688252706491200/914084091/

http://battlelog.battlefield.com/bf4/zh/battlereport/show/1/963389605999447872/914084091/

http://battlelog.battlefield.com/bf4/zh/battlereport/show/1/961938696475860480/914084091/

http://battlelog.battlefield.com/bf4/zh/battlereport/show/1/961938696475860480/914084091/

Thanks for the information. Will review your case and come back to you as soon as everything is reviewed.

my friend want claim also

Your friend won't be able to appeal his ban successfully until his PunkBuster violation is marked as a false positive. He can appeal at https://www.evenbalance.com/support.php

Yes. Punkbuster violations need to Be appealed at Even Balance.

http://battlelog.battlefield.com/bf4/battlereport/show/1/1010509310067730496/914084091/

This battle report HSKR is literally impossible to achieve without cheats and it was also not from stat padding.

Appeal Denied.