Abstract: The self-incompatibility is controlled by multi-alleles in S-locus,A great deal of S-alleles has been identified. The reaction of the self-incompatibility is a complex process which involved the recognition between the pollen and the stigma. The review mainly discussed the mechanism and some proteins related with self-incompatibility,the identification and utilization of self-incompatibility. The study and development of self-incompatibility in plant was prospected.