Particles with motion blur

Hey. I have a problem about motion blur in cycles render. I want to make motion blurred spark effect for my particles but motion blur effect my scene too. How can i seperate them ? Thanks! :slight_smile: (Sorry for my bad english)

Are you using object particles ?
Have you baked the particle system ?
Why have you not supplied a demo blend file for review so we can see what you have rather than having to try to extract the useful bits of info from you

Thanks for your reply!

Yes it’s object particles.
Nope i never try that i don’t know how to do actually.
Here my blend file :

With your blend file

Motion Blur off

Motion Blur turned on

As you can see there is motion blur on sword too. I don’t want that.