Abstract: In order to study the influence of heading-flowering stage of hybrid rice morphological characteristics and yield structure under different waterlogging environment. We used the hybrid rice ‘Xiangfengyou 103’ as tested material, based on some traits related to growth development (e.g. rice leaf number, aerial root, lodging) and yield components, sensitivity variation of hybrid rice at heading-flowering stage were investigated comparatively under different experimental flooding depth and time length. Results showed that: with the same depth of submergence, the number of rice leaves had highly significant negative correlation with the length of submergence time. The ratio of the aerial root stem was positively correlated with length of flooding time and negatively correlated with flooding depth. Lodging occurred during heading-flowering period was stem lodging there was a significantly positive correlation between the ratio of stem lodging and percentage of submergence time. About yield structure, hybrid rice at heading-flowering stage was very sensitive flooded more than 5 days, and almost have no harvest, more than 3 days, seed-setting rate of only 28 capsules, less than 74 grains of CK, yield was very low. By studying the morphological characteristics and yield structure changes in heading-flowering stage in waterlogging environment of hybrid rice, we knew the changes of morphological characteristics and yield structure of hybrid rice in heading-flowering stage, we understood the adaptation mechanisms and environmental sensitivity of hybrid rice in waterlogging environment ,these could provide the data base of morphology and yield structure for the identification of flood ability.