when Ray trace is on, all of shadows become blurry

here is my setting for PostProcessVolume

I don’t know what to do

any help?

Tough to say since you didn’t provide a comparison on and off.
But raytraced shadows are more realistic, and shadows in the real world are very blurry.
You can also control the shadow’s softness/blurriness in the “raytraced shadows” setting, I believe it can be found on each light. I forgot what it’s called, it’s a slider.