Objective The Objective of the investigation was to study how compound danshen injection(CDI)affected the kidney function and pregnant outcomes of patients diagnosed as mild preeclampsia. Methods Samples are randomly divided into two groups:observation group,in which patients were treated with magnesium sulfate,and control group,in which patients were treated with Danshen injection. Results In control group the treatment showed valid effect in 78.13% of the patients,and in observation group the ratio was 96.88%, which was remarkably higher. Conclusion To improve the pregnant outcomes and prognosis of mild preeclampsia,compound danshen injection should be recommended during the clinical practice.