In order to relieve the hazard level of rice blast and sheath blight in semi-arid area of Heilongjiang Province, using the technology of silicon fertilizer in combination with pesticides to carry out the diseases control test.The main results indicated as following. Under the conditions of silicon fertilizer 30 kg/ha, 2% kasugamycin 1800mL/ha and 27% tebuconazole·benziothiazolinone 450 mL/ha, the diseases control results were obvious and the control effects to rice blast and sheath blight were 100% and 96.59%, respectively. Furthermore, the yield of rice was 9145.50 kg/ha, the production increased 5.03% and the disease loss rate reduced 5.03% than the control.