suggest me a way to scale up ...

[omido994]

add a scale operator and switch it's mode to absolute, use the sliders with autokey to scale on three axis from 50% to 100% and switch the keyframe offset to sync by particle age.

here is a scene that describes the solution

thanks
i said by particle age(Relative moddes) not absolute , it is almost non linear animation

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add a scale operator and switch it's mode to absolute, use the sliders with autokey to scale on three axis from 50% to 100% and switch the keyframe offset to sync by particle age.

here is a scene that describes the solution:

concisely without key frames
the answer is for newbies
everyone knew that to slide and set key frame !