Thank you reply.i set android setting in UE4 editor,but no use,this is my problem screenshots 
,my head can rotation,but the gear vr screen stop rendering,are you meet this problem for gear vr?expect you reply.think you.
PS :After many times i tired,i found out there is solution,if i turn off the wifi and mobie data on my S6,this problem gone!!!
PPS:The empty scene too!
please,i have spent almost 2 mounth on this game,even increase FPS from 25 to 60 all the time…please help~