Abstract: In order to explore the effect of plant foliar fertilizer Silamol on the seed production of hybrid rice, by taking Quan 9311A, Huazhe 2A, Nuo S, 1892S, Longke 638S, Huawei 338S and 1678S as the test objects, the effects of spraying different concentrations of Silamol on the seed production yield of hybrid rice were studied. The results showed that in the plot experiment, the allogamy fructification rate of the sterile line 1892S sprayed with Silamol increased by 4.7%-12.9% and the plot yield increased by 11.11%-13.75% compared with the control group. In the large-plot tests of seven different locations, the seed production of hybrid rice sprayed with Silamol was higher than that without spraying Silamol (CK), and the yield increased by 4.7%-12.7%. The daily pollination experiment of the two-line sterile line rice 1678S was carried out. It was found that Silamol could significantly increase the allogamy fructification rate of 1678S at the full flowering stage. The above analysis showed that spraying different concentrations of Silamol at the flowering stage in the seed production field of hybrid rice had better yield increasing effect, which could be popularized and applied in the seed production of hybrid rice.