The genetic behavior of fertility restorationgenes of the eytoplasmic male sterile line Maxie A was studied to facilitate the use of Maweizhan male sterile cytoplasm. The F,F,and Fof Maxie A/Minhui 63 were grown in paddy field, 1993-1995. Meanwhile, some of the Fplants were testcrossed with the maintainer of Maxie A. The fertilities were