Abstract: Both Red(R) and Far-red light(Fr) inhibit the growth of embryonic bud of rice As for embryonic bud sheath, R inhibits its growth, Fr shows partial reversible effect. The single IAA of certain concentration encourages the growth of sheath, but the effect of GA₃ is opposite to that of IAA. As far as CAT and POX of rice is concerned, R encourages their activity, however, Fr shows the effect of reversibility. Both the single 10^-2 ppm IAA and the single 10^-2 ppm GA₃ encourage the activity of CAT and POX. The result that plant hormone and light are given simultaneously is complex. In 10^-2 ppm IAA, R shows its encouragement, while Fr shows its inhibition; but in 10^-2 ppm GA₃, on the contrary, R inhibits their activity and Fr demonstrates its encouragement.