I want to buy some btc with paypal ,I haven't a good paypal and (I can't pay as gift that's the problem)
so anyone can help me
Availing an escrow provider for a PayPal trade is useless as the buyer (which is you in this case) can easily reverse the transaction within 180 days.
Now if you want to let the escrow provider hold your BTC for one day more than 180 days, it's a different situation.
But no one will do that in first place.
So its better to sign up on Virwox.com and buy your required BTC through PayPal.
There are many trusted escrow service sites but if I may advise why don't you pick one trusted escrow from bittalk.
Because it is useless to pick one from here. Read the reason above.