Abstract: Different types of photoperiod-temperature sensitive genic male sterile lines,Nongken58S,7001S,5047S.Peiai64S,AnnongS-1and 5460S were used to observe the individual fertility,The results showed that except AnnongS-1,the highly significant difference of fertility among florets of a plant was found in other seven male sterile lines.The differenee of fertility among florets was not effectively reduced by continually bagging single plant.A few selfing seeds were found during sterile pe-riod,The selfing seeds distributed randomly on panicle and possessed photoperiod-temperature sensitive sterility like original male sterile lines after they were planted.