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I wanna calculate a system's magnetic moment. I set ISPIN=2, but didn' t set MAGMOM . And I wanna to see how the Hubbard U influence the magnetic moment when I using LDA+U method. But I got the same magnetic moment according to different U. So must I explicit the atom's magnetci moment before calculation to get a reliable result?

by default, the magnetic moments are set to 1 if not given explicitely.
VASP converges to the correct magnetic state, but you can eg. enforce a high-spin solution of your system by choosing large input magentic moments.