Hello, I export the character to UE4, in edit mode the hair looks correct, but in play mode, the hair became strange, how to fix this issue? Thanks.

Cloth physics for hair is on.
1. double click on your character
2. go to windows / clothing
3. delete clothing data ( upper left)

If you want to use physics for the hair , check your physic collision capsules and play with the settings of the cloth physics.

Oh, Bassline303, Thank you very much !

Thank you very much!