Abstract: The flowering habits and outcrossing characteristics of 5 newly-developed japonica photoperiod/ thermo-sensitive genic male sterile lines were studied. Results showed: The flowering duration of single plant and single panicle of Y27S is the shortest, 118S is close to control N5088S, B30S, 116S and 117S are comparatively longer. Flowering kinesis of every day in a panicle of Y27S, 116S, 118S and 117S are similar to that of restorer line 41678, but B30S lag behind 41678, control N5088S is earlier than it. Flowering kinesis in a day in a panicle of Y27S, B30S and control N5088S are close to that of 41678. Although the anthesis time of 116S is dispersed, its flowering is earlier and forenoon flowering rate is relatively higher. The anthesis time of 117S is concentrated and the flourishing flowering is late, while 118S is dispersed and late. Spikelet opening time of 116S and 118S is the longest, 117S is relatively short. As for the stigma exsertion rate, 118S is the highest, 116S is the lowest, and that of 118S, B30S and 117S are more than 60%. The lasting time of the stigma vitality of Y27S is the longest. The fall of the stigma vitality of control N5088S is the slowest. All the P(T)GMS have higher wrapround spikelet rate and relatively lower indehiscent spikelet rate.