Microspore development and pollen gendnation in vivo in predeveloped embryorice (PDER) were observed using light and scanning electron microscope. The results showedthat the procedure of ndcrospore development in PDER was the same as that inconventional rice strains, in which mature pollen grains were filled with starch grains. Whenflowering, only part of mature pollen could gerndnate well and get into stigmatic tissue byshort tube, and most of them behaved abnormally: (1) Pollen did not gendnate, butexpel1ed mass of pollen content from the gerndnal aperture. (2) Pollen tube was very small.(3) Pollen tube swelled or broken outside or inside the stigma. (4) Pollen tube entered thestigma and then got out of it. (5) Pollen tube crawled (twisted) at the stigmatic surface. (6)Pollen tube was coated with pollen content. (7) Pollen tube growth direction was reverseinside the stigma. These abnormal phenomena were discussed.