gohalves

Thanks Erik, I tried, and It works! but there are still some tiny areas on the displacement surface that are not static, these tiny areas are flashing all the time! I don't know why.Thank you!

Thanks Erik, yes indeed,I was animating the camera. As you suggest, I should do displacement in object space? But how to go about it? Is this the only way to fix this? Thank you!

I made an custom shader which had a displacement in it, when I was try to render out a image sequnence I found that the look of this material changes wildly which is not what I wanted, how can I make the displacement shader stop changing the look while rendering?