Dear Nawrot, Thanks for your reply…
i have try, and still failed. i hope you can give more clue what should I do.
anyway here my blueprint in cube
for now i move the box use F button from my char, simple and here the Blueprint
and here i put the box, anyway i use default ThirdPersonExampleMap
for now, in box, in collision option. i set [generate overlap event] as true (as you suggest). and in [collision preset] = overlap all.
and here the result when i press F button to make box down. and when the box overlap char log output is “begin with” which mean collision success between char and box. 
but. when i move away the char. and continue press F button let the box hit the floor. there are no log anything 
which make me sad.
i have try to change all option in [collision preset] of the box, one by one. repeat the step set box from above and press F button to hit the floor. but still i don’t get any log what i want.
what i want, the cube give log when collision or overlap anything object like floor, wall or every static mesh. (without transform the floor, wall, other object into blueprint)
ps: i dont care it become on hit, on begin overlap or everthing, as long there are some output, it would be okay for me.
Many thanks.