Help Is there a way to fix particles position after changing them?

[MadMin]

Hi,

I tried to apply some change to the particles  in a skinned mesh using "PushDataToSolver(ParticleData.POSITIONS)" ， it worked well in that frame, but would recover to initial positions in the next frame. 

Is there a way to keep the change? I just want to modify the shape of  some part of the  model  with the rest particles  being simulated.  

Thanks in advance!