Soil acidification is the most serious in southern China.The effect of applying limestone powder to acid soil on yield and nutrient interception of Chinese milk vetch was explored to provide basis for the simplified and efficient cultivation. Pot experiment was conducted，and seven application rates were set up in strong acid paddy soil and acid red soil.Each pot contained 2 kg of soil，and the amount of limestone powder was 0 (CK)，0.267 g/pot (T1)，0.534 g/pot (T2)，0.801 g/pot (T3)，1.068 g/pot (T4)，1.335 g/pot (T5)，1.602 g/pot (T6) (which was equivalent to 0，600，1200，1800，2400，3000，3600 kg/hm²)，the yield，nutrient interception，soil pH value and exchangeable acidity of Chinese milk vetch were measured during the flowering period.Compared with CK，in paddy soil，the fresh production of Chinese milk vetch increased by 41.5%～122.8%，and the yield increased first and then decreased with the increase of application amount. The yield of fresh grass was significantly higher than CK in the T4 treatment.In red soil，the yield of fresh grass increased by 175.2%～989.1% than that of CK，and the improvement effect on red soil showed an increasing trend with the increase of application rate.The fresh grass yield of T6 treatment was significantly higher than CK.The amount of nitrogen intercepted by the application of limestone powder in paddy soil and in red soil increased by 147.5%～614.7% and 285.7%～1316.8%， respectively.Compared with CK，in paddy soil the pH value of the soil with limestone powder increased by 1.5%～5.1%，while the exchangeable aluminum decreased by 7.3%～55.9%.Compared with CK，in red soil，the pH value of limestone powder increased by 3.4%～18.8%，the while exchangable aluminum decreased by 32.3%～95.4%.The application of limestone powder on the red soil showed a extremely significantly positive relationship between the soil pH and the yields of fresh grass and hay.Acidified soil was the main factor limiting the increase in Chinese milk vetch production and nutrient interception.Applying limestone powder could increase Chinese milk vetch production，nutrient interception，soil pH value and reduce soil exchangeable aluminum levels in paddy soil and red soil.Under the same dosage，the improvement effect on red soil was better than paddy soil.When the soil pH value of the improved paddy soil and red soil were 4.66 and 7.05，respectively，the yields of fresh grass and hay of Chinese milk vetch were the highest.