Abstract: The application effect of Lyuxinyuan soil conditioner in paddy field was verified by setting different dosage of soil conditioner in acidic magnesium deficient paddy field. The results showed that applying 40 kg soil conditioner, 50 kg soil conditioner and60 kg soil conditioner per 0.067 hm2paddy field could increase rice yield, with yield/input ratios of 2.00, 2.88 and 2.57, respectively.The application of soil conditioner can effectively increase soil pH value, improve the magnesium nutrition of rice plants, effectively prevent the occurrence of magnesium deficiency yellow leaf disease and increase the yield.