How to solve this problem?

Please help me… why I got something like a snow on my Rendering Image, like the images attached.
I use Sketchup 2015.

Please Help me…

Without even knowing what you are using to render, no one can help you. To me that looks like calculation errors in the rendering algorithm - some older rendering plugins have had those. Have you tried to increase your quality settings? Have you tried asking directly from the plugin authors or their website?

Anssi

Very thanks Anssi… I will try that again.