for example,when a car run cross a region where there are some leaves,the wind due to moving car make leaves flying and rolling .

anothe scene, the wind is blowing to the ground ,and dust is blowed and rolling.

i use metaball as attractor, but can't get the correct effect.

sorry for my noob english.

I think there's an example in the helpcard for the Torque POP.

edward
I think there's an example in the helpcard for the Torque POP.

but seemingly , torque POP just make particles spin around its own axis.

metaball attractors would probably be the easiest way if you can get it working…

if not, take a look at the turn pop. You can make the particles turn and swirl based on distance from the metaball, or on a random attribute (that's based on velocity/life/whatever)