总结了几年来对两系杂交稻生长率的研究结果，表明两系杂交稻生物学产量以中期生长率最高；全生育期间，干物质呈Ｓ形曲线增加，生物学日产量呈抛物线变化，生育前期和后期增加的绝对量少，中期增长量大。从而论证了充分发挥中期优势对增产的意义。并指出栽培中片面追求“促、控”效应违背了两系杂交稻本身的生长规律，应充分发挥水稻自身的调节功能，维护正常的自然增长。 The results of the research on the growth rate of two-line hybrid rice in recent years are summarized. The results show that the biological yield of two-line hybrid rice has the highest medium-term growth rate. During the whole growth period, the S-shaped curve of dry matter increases, The absolute increase in the early and late period was small with a large increase in the medium term. It proves that giving full play to the mid-term advantage of the significance of increasing production. And pointed out that the one-sided pursuit of “promoting and controlling” effect in cultivation violates the growth law of two-line hybrid rice itself and should give full play to the regulatory function of rice and maintain normal natural growth.