The soil culture were carried out to study effect of available calcium and nitrogen nutrition on the effective calcium content,dry weight,and the changes of the diseaseresistant indexes in the tomato after inoculation of pathogenic bacteria.The results showed that disease indexes,leaf tissues of phenylalanine ammonia lyase(PAL),polyphenol oxidase(PPO),peroxidase(POD),catalase(CAT)activity,malondialdehyde(MDA)and cell membrane permeability were significantly increased through the inoculation,especially in the condition that calcium was 241.36 mg·kg-1 and available nitrogen was 553.63 mg·kg-1 in soil,of which the effective calcium content and dry weight were higher,disease index was lower,four defensive enzymes activity increased quickly and peak were higher,MDA and cell membrane permeability were lower through inoculation in treatments.Nitrogen content was increased with the increase of soil available nitrogen.In summary,the right amount of calcium relieved the inhibition to resistance ability of the tomato blight and improved the effectiveness of calcium in the soil with high nitrogen content and improved the diseaseresistant ability to tomato blight.