Thanks for all of your advices.
Now I trade through Velocity4x, and this week, I got some trouble with their server : froze, disconnect..and when I order, sometimes it stated : the Trade is in busy context..

I asked them, and they answered because they were upgrading new server.. Hope it will be better next week.

http://www.cftc.gov/files/tm/fcm/tmfcmdata0607.pdf
http://www.cftc.gov/files/tm/fcm/tmfcmdata0608.pdf

In page 2, I saw Hamilton William LLC, and the net capital was negative , so I have some worries about that ? Is it ok or not ? Anyone can give me any furhter information ?

FXLQ is their Provider , so is it safe for my account ? if there are any complaints, they should be addressed to FXLQ ?

In funding instruction, I read this :

Beneficiary: Hamilton Williams LLC
Account Name:Hamilton Williams LLC Customer Funds Account
Account # 0028 7485 9618

They said "Customer funds are kept in an entirely separate bank account from any company operating funds, thus prohibiting any activity other than client trading to occur in those accounts" but If Beneficiary is Hamilton Williams LLC, so can they control our account ? Is it safe or not ?

And if Velocity4x bankrupt, what should we do ? where and who we can contact to get back money from account ?

Thanks for your help.