Tai Lung's main weakness is iron claw.

ive been using iron claw to atta him and leaping monkey to throw his dynamite back, but
still nothing, what do i do

well if you do have a x box controller you push Lt, then you have this ball around you
then when tai lung attacks and you are in the ball push the x button then you'll see him
roll. or you can push x x y while he is not hitting you.

just keep on using iron claw when you see him running at you. when you hit him, your
health increases. try to dodge his hits and those explosive things he throws at you. when
you have full health and turn to the dragon warrior, hit him with iron claw once more and
he will hit you again but you will go on to the next part of the watterfall. do the same
things again and then you shall kill him

you press triangle for attacks

when tai lung flies up to grab the barrel stand in the middle
of the bridge and when he throws the barrel grab it and do mantis fury and throw it back
at him

Ok,so you have to be quick. Very quick. Do the jumps on the waterfall to the first bridge
on the fight scene. Quickly use iron claw through him, not on him. You have to direct it
through him. Very quickly do this over and over again, one after another, just dragging
left and right without a pause. If tai lung hits you or flies upward, run to the left or
right of the bridge and stay there until you see SOMETHING like a barrel or himself. When
you do see something, repeat this until you have full chi. Then just do a normal attack on
Tai lung. He will move on to the second scene. Do the same. Then the third. Do the same.