Abstract:Position observation,pollen-ovule ratio and bagged pollination were utilized to study breeding system of Ceratoides arborescens.The results showed:(1)The pollen life was 6 days,and the pollen-ovule was 1 351 189±391 779;there were cross pollination and self-pollination,and cross pollination dominated;the breeding system belonged to facultative xenogamy.(2)The stigma receptivity of C.arborescens was 6 days if existing pollen (5～10 days after stigma exposed),than the stigma would be excessive growth;the stigma receptivity was longer in lacking of pollen and can not complete the pollination,may maintain 9~20 d (9～20 days after stigma exposed).(3)Artificial inseminate showed,the best time of inseminate was 6～7 days after stigma exposed,and had highest seed set (94.83%).The average seed set was 4.93% after the stigma lose the vitality (21 days after stigma exposed).Time range that had higher seed set was wider than the best stigma receptivity.It formated reproductive compensation mechanism in the long term evolutionary process:a higher P/O,the stigma receptivity was longer,In the advantage of having cross pollination,it also took self-pollination simultaneous,which is significant for wild population restoration.