Tiananmen Square is has the same setup as Frogger. So if you played the original Frogger, then you already know how it's done. ;-) But, for the uninitiated, here is the complete howto guide:

There are five holes in the razorwire fence on the other side of the street. Your job is to get five guys to freedom but putting one of them into each those fence holes. Avoid the fence, as it will kill you if you come near it. You're also avoiding the tanks, as they will also kill you. The Sidewalk is safe, but don't loiter there. The middle lane of traffic is also safe during wave one. Once you've filled all 5 fence holes, the guys will dance and you'll move onto Wave 2.

Extra tips:
-Don't go "near" the fence, then try to move right/left into the hole. Instead, go right/left to maneuver them so that they are dead-center to the hole and then move forward.
-When in doubt, go back to the sidewalk.
-You can only fill each hole once.