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We experimentally study the spin exchange collision in ultracold 40K Fermi gases.The quadratic Zeeman shift,trap potential and temperature of atomic cloud will influence on the spin changing dynamics.Dependences of the spin components populations on the exteal bias magnetic field,the optical trap depth and the temperature of atomic cloud are experimentally investigated.The spin exchange from the initial states to the final state are observed for different initial states.This work shows an interesting process of reaching equilibrium by redistribution among the spin states with the spin exchange collision in an ultracold large-spin Fermi gas.