Abstract: The effects of foliar spraying plant growth regulators (PGRS), i.e., trinexapac-ethyl (TE), ethephon(ETH), paclobutrazol(PP₃₃₃) on yield and yield components of ratoon-crop rice were studied.Results showed that PGRS reduced production of main-season.There was a different response between three varieties to PGRS for yield of ratoon-season, PGRS treatment increased yield of jiafuzhan and reduced yield of tianyouhuazhan.However, yield of Yongyou2640 increased by TE or PP₃₃₃ and decreased by ETH.Thus, total production were decreased by PGRS treatment in which TE had the slowest decline compared with non PGRS treatment.