Abstract: 〔Abstract〕 Objective To explore the application value of coagulation test index in clinical diagnosis and treatment of pregnant women with hypertension in the third trimester of pregnancy in Shenzhen by comparing the difference of coagulation indicator between pregnant women and healthy pregnant women. Methods A total of 393 pregnant women who underwent prenatal examination in Shenzhen Maternal and Child Health Hospital from April 2021 to December 2021 were selected and divided into the first trimester group (177 cases), the second trimester group (108 cases), and the third trimester group (108 cases). In addition, 130 healthy non_x0002_pregnant women in the same period were selected as the control group, and 160 pregnant women with gestational hypertension in the third trimester were selected as the case group. The prothrombin time (PT), activated partial thromboplastin time (APTT), fibrinogen (Fib), thrombin time (TT), antithrombin Ⅲ (AT-Ⅲ) and D-dimer (DD) data of all pregnant women were detected and statistically analyzed. Results PT and AT-Ⅲ in case group were lower than those in the normal first, second and third trimester group, while Fib and DD were higher than those in the normal first, second and third trimester group, and the differences were statistically significant (P < 0.05). Binary logistic regression analysis showed that Fib and DD were risk factors for gestational hypertension in the third trimester. The area under curve (AUC) of PT, Fib, AT-Ⅲ, DD and combined detection were 0.684, 0.571, 0.646, 0.688, 0.790, respectively, P < 0.05. Conclusion Detection of the changes of coagulation parameters of gestational hypertension in the third trimester of pregnancy can provide effective basis for doctors to accurately diagnose and treat gestational diseases.