Ty to all

I made shearch and i find 2 way :

1- trading on poloniex ( can earn big but not without risk )

2- a new p2p site who is offering some features :
   - a p2p loan with some interest but risky if you invest in a scam loan
   - a "bank" system who multiply you btc with an interest of 5%/years (0.013%/day) with daily payment (you can reinvest them in loan for exemple)
   - a little exchange system for buy/sell btc a good prices
It's btcpop.co
I have chat with somes people in this site who invest on loans here who recommend me to do that only if i am not scare to lost littles ammount of btc in loans

You can check the site here : http://www.btcpop.co/index