I download jetbrains toolbox and open it.
I found that some app's(such as idea IDE) icon display incorrectly. And all this icons use .svg image and in my ~/.local/share/application .
I googled but no answer.

I'm observing a similar behavior with Jetbrains apps (which use SVG icons) on Kubuntu 17.10, KDE Plasma 5.12.3.
However this only happens when exploring the different launcher categories and menus and not if the icon is displayed after performing a search in the launcher.