Hi,guys i have a caligraphy image,and i want to import it and make a particle morph effect on it ,so the calligraphy letter can explode or flow with ink or something,how can i achieve that ?

Use your image as the emission (scattering on it particles) and run a simulation of these with the help of fluids as you see fit.

To direct the particles in a certain direction the common approach I see is to use a mesh normals as your velocity vectors, to make it user friendly if you have two copies of you caligraphy as geometry, one the source size and another scaled up and translated and the normals of the first pointing to the second you have a very easy way to manipulate it.

There are some nice video tutorials of particles in a fluid you surely will find on cmiVFX and the like.

hope it helps
jb