How could I set the mass of Third Person Character?

Hi guys, I tried to make the character in the third person template to hit some thing, and made a box moveable for hit.
But when I set the mass of box to 500000 it can still be hit fly by character.
I’d tried same thing in Vehicle template Project and box is worked when hit by sedan.(less mass can be hited easily, high can’t)
Then I tried to set the mass of the third person character.I setted the mass in the character movement and the capsuleComponent, but no one worked.And the mass of mesh can’t be set under 1630.4375.(When I setted it, it turn back to 1630.4375).
So How could I set the mass of character?Thanks!