How can I get the dump file when editor crashed?Or how to debug the crash?

Development Platform & Builds Debugging, Optimization, & Profiling
, , , ,
2

Dump files are usually located in:

YourProject/Saved/Crashes

There should be UE4Minidump.dmp files in those crash folders.

To debug a crash you can attach Visual Studio to your game process, or debug the engine from visual studio.