I let my sister using my car for over a year .She made a payment, but
now she got her driver license suspended and she still driving the
car,I really want to get my car back with out leting her know. because
i afraid some thing will happen to the car. Do you know any 
organization in Florida to get the car back for me?She live with her
boyfriend's apartment and the apartment have the security gate that
hard to get in.I need the professional to get the car back for me.I
live in Tampa FL.

Get your paperwork together to show that you are the legal owner of the vehicle.
Find out where she works or places she frequents.  Go to a tow company
and tell them the situation and prove you are the owner of the car. 
When you locate the car where it can be towed call them to tow the car
away.

She'll probably call the police but the tow company will have a letter
from you authorizing them to tow the vehicle.  Be sure the cars
registration is solely in your name (or have all the owners authorize
the towing of the vehicle.).

Do as daniel suggested, get all your ownership papers together, and
hire a repo company to get it for you. It should be reasonable because
they don't have to hunt it down, just take it in the middle of the
night. They don't need keys, and they notify the police they are about
to take a car.

If you have extra keys, you can go get it yourself, or send someone to
drive it off for you. You might be able to get extra keys by calling
the dealer with the make/model and vin number. Or, we can find where
to get keys for you in a new question.

Whoops, here's some leads on repo companies in your area:
http://www.searchbug.com/directory.aspx/Business/Financial_Services/Credit_and_Collection/Repossession/