I have two cats one is female and 3 years old and one is male 2 years old ,and the male cat is pinning it to the floor and bitting its neck.. my female will just swip and his . The male does the same to my female cat too... will he kill the kitten??

Sounds like he's asserting his dominance. He's telling the kitten who's boss.

How old is the kitten? Male or female? Fixed or unfixed? Are the other cats fixed? How long have you had the kitten? Is there growling, hissing, spitting, clawing, or other aggressive behavior happening?