I found difficulties makinig fireworks from Delerium Digieffects to emit their sparkles and make writing , i mean i want this effect to to take the shape of the letters once they explode.
it was very easy to do that in past years using 3d sudio3 in dos enviroment by configuring IPAS effects .
i wounder if can see this effect acieved in AE.
is there any way to do it in illusion or Trapcode Particulrs.
You don't. There is no such thing as shape targets either in Particular or Illusion. Your best bet is to use Particle playground and use layer maps to drive your forces to form the letters. You can combine this with a Particular layer and if you tweak thinks right, it should look just as good.