Why is my player falls down to the ground and keep shaking forever...?

Development Character & Animation
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1

I created a default 3rd person scene, and import my FBX mesh from CINEMA4D as the ground.
I think it has a right collision.
Without the person’s “Simulate physics” checked, he just falls through the ground shown as below.

95198-fallthrough.png

With the “Simulate physics” checked, he falls down and keep shaking forever like this…

95199-screen+shot+2016-06-20+at+10.37.19.png

95200-screen+shot+2016-06-20+at+10.37.28.png

95201-screen+shot+2016-06-20+at+10.37.38.png

95202-shaking.png

Anyone could help me out? Really new to UE4 here.

2

95522-jun-22-2016+16-04-43.gif

I made a gif hoping this would explain clearer.