LineTrace error in VR mode

Hi, I got a problem in my VR test. The LineTrace looks run well in normal mode, but It seems begin from a wrong location, I`ve tried sevral methods to get the camera/eye location, but still got the wrong trace. For the character, I set the capsule heigh 178, eyeheight default to 64(160 got a very tall view), and add a scene component with camera component as its child. Anyone could help me? Thanks a lot!