Abstract: What anther development and microsporogenesis of male-sterile lines (“Peking No. 8” and“Earliness No. 1”) were studied in comparison with those of their main- tainer lines. The results obtained are summarized as follows: 1. Pollen aborting in male-sterile lines might occur in various stages of microsporogenesis. However, the degeneration of pollen at later stage of microsporogensis of male-sterile lines was the critical stage, so that the microspores at this stage failed to carry on' their male gametogenesis in many cases. 2. Before the commencement of microsporogenesis, more than 90% of the microspores of male-sterile, developed in the similar manner to that of maintainer lines, and only a few of them revealed various abnormalities and led to the abortion of microspores with the following abnormalities: 1. the abnormal fusion of anther cham- bers, 2. the disorganization of microspore mother cells with normally developed tapetal layers, 3. the microspore mother cells fused together to form pesiplasmodium, 4. the disorganized microspore mother cells fused with tapetal cells to form pesiplasmodium, some microspore cells transformed into unusual giant cells, 5. the tapetal cells disorganized before microsporogenesis and 6. and formed a tapetal pesiplasmodium, the hypertrophy of tapetum.