In order to explore the relevance of cytological events of pistil and stamen development to the morphology of spikelet lemma in rice,series of observation were made using japonica rice Zhonghua 11 as material.Length of spikelet lemma corresponding to gametophyte development stage,such as male and female mother cell stage,meiosis stage,spore formation was statistically analyzed.The relevance of caryopsis morphology and lemmas length to the inner developmental stage of embryo and endosperm was investigated.The results provided a simple ocular reference to ascertain the reproductive developmental stage of pistil,stamen and seed in rice.It will benefit the research about reproductive development and molecular mechanism in rice.