Abstract: In order to flowering at the most appropriate time in a year, plants monitor the environment signals and response with an endogenous complex molecular network. Contrary to model long day plant Arabidopsis, model short day plant flowering is delayed under long day condition with a critical day length response. The extensive research of flowering molecular pathway about rice and Arabidopsis revealed that there are several genes are highly conserved between rice and Arabidopsis . Rice also has unique gene which involved in response to photoperiod. Here, we discuss and conclude the recent understanding of flowering time in rice from the perspective which describe as follows: The molecular pathway of rice response to photoperiod; Natural variation of rice flowering time and application of flowering time gene; Circadian related gene in rice; Phenomenon of night break and critical day length response and the relationship between flowering time and yield.