I used postcss-salad, It just a postcss plugin bundle...
It isn't standard css and It needn't to be checked. I Just want to disable css checking, How should I do ?
Error like this (v0.6.2):

You can look at postcss-bem directly.
Will add option later.
Thanks.
When using postcss, you should use <style lang="postcss"> otherwise there is no way for me to tell what's inside the style tag.
Disable validation for certain region is tracked in #179.
I should really take time to finish my PR for https://github.com/vuejs/vue-loader/issues/680...
vetur.validation.script and vetur.validation.style will be available in next release.
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Will add option later.