Abstract: The test of exogenous ABA with different concentrations on rice G46A-line at different spraying time was conducted. The results showed: Exogenous ABA can evidently reduce panicle sprouting percentage of rice G46A-line at every spraying time. The effective concentrations of ABA are different at different spraying time. The effective concentration (90mg/L) is high at early spraying time, and the effective concentration (50mg/L) is low at late spraying time. The exogenous ABA affect seed setting percentage and grain dry weight. It was not found anything negative on F1 germination rate in ABA treatment after a period of storage.