Abstract: By localized experiments, this paper studied the effects of different fertilization systems (organic compound fertilizer, biological fertilizer, organic fertilizer, stable manure and fertilizer) on activities of urease and catalase in soil, and also studied on the correlation between soil enzyme activities and soil nutrient factors, which is going to improve the fertility of saline soil and the activity of urease and catalase in saline soil. The results showed that, all these five kinds of fertility betterment could improve the urease activities obviously, and it presented a trend of first rise and then drop, the effect of organic compound fertilizer on urease activities was the most significant, increased 1.6 fold compared to the control group. Biological fertilizer and organic fertilizer increased 1.335 fold and 1.322 fold compared to the control group. Though the effects of all treatments on catalase activities were not obvious, but were all somewhat increased. Through the study on the correlation between soil enzyme activities and soil nutrient factors, we drew a conclusion that available P content and total N content had most important influence on urease activities, correlation coefficient reached 0.8737 and 0.8451, correlation coefficient between catalase activities and organic content, available N content was respectively 0.796 and 0.754.