Thank you for your reply.
I try to create a new 4.17 VRTemplate, just copy 3D Widget, Meshes, Actors, Volumes into it. All Pawn and Controller use of the VR Template default, Widget Interaction component also cannot work.
I’m sorry I can not upload a picture due to the network problem. But I found the reason: my pawn and Widget Interaction component is inside a huge blueprint (I use to determine the player’s position), this actor only has two OverlapEvent ( Begin and End) to change an enum state. Just delete this blueprint actor Widget Interaction component will act normal, but for functional consideration, I can not delete this Actor.