I sent in a accident from binance btc to my bitstamp bch addres,are the coins lost or is it possible that bitstamp exchange can fix my coins ?.
Coins don't get lost, you can check https://blockdozer.com/ to see if they were moved again.That being said: Bitstamp has the private key, and it will be entirely up to them whether or not they recover this for you. Some exchanges do, some don't. It might also depend on the amount you sent.
You should send a message to their support and ask.
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(my english is not 100%ok sorry 
If you post your message to Bitstamp here before sending (leave out private details), I can help you with your English if your message is unclear.My advice: keep it short and to the point.
