According to the mensuration and analysis of soil moisture,soil bulk density,soil hardness,corn yield and agronomic characters,we researched the change and correlation analysis between corn yield and soil physical properties by different subsoiling time and different subsoiling effect.The results showed the highest output was 9 4425 kg/hm2 after subsoiling 40 cm in spring,the corn yield was higher 1884% than CK,kernels per row and weight of hundred grains were also best.We found that the corn yield was highly significant positive correlation with oil moisture and was highly significant negative correlation with soil bulk density and oil hardness at seedling stage.During the growing period，the soil moisture with different treatment was higher than CK,soil moisture after subsoiling 40 cm and 30 cm in spring was higher than other treatments.