[Closed] how to drive ragdoll with script

Hi all:

In my project, I want to drive the ragdoll to move using script. Before I start, I tried first. I found out that I can not make the bones move if I simply set the bone with a new transfrom. In another words, I did in this way.
If it is a biped node, I used biped.setTransfrom node #pos point3
If it is a bone, I simply update its transform.
But the ragdoll refused to move. What should I do to move all the bones of a ragdoll? Please help me.
Thanks!