Abstract: Objective: To observe the clinical effect of modified Shenghua Decoction on retained products of conception with qi deficiency and blood stasis syndrome. Methods： A total of 96 patients with retained products of conception with qi deficiency and blood stasis syndrome who were treated in Hangzhou Gongshu District Hospital of Traditional Chinese Medicine from November 2022 to November 2024 were selected and divided into the control group and the trial group according to the random number table method，with 48 cases in each group. The control group was treated with Xian Yimucao Capsules, and the trial group was treated with modified Shenghua Decoction. Both groups were treated for two weeks continuously. The clinical effects and curettage rate， the traditional Chinese medicine syndrome scores， scores of Visual Analogue Scale（VAS）of uterine contraction pain， endometrial thickness， three uterine dimensions， area of retained products， and uterine artery blood flow parameters [resistance index（RI）， pulsatility index（PI），peak systolic velocity（PSV）and end diastolic velocity（EDV）] before and after treatment were compared between the two groups. Results：After two weeks of treatment，the total effective rate was 95.65%（44/46） in the trial group，higher than that of 80.43%（37/46）in the control group（P＜0.05）. The traditional Chinese medicine syndrome scores and VAS scores of uterine contraction pain in the two groups were reduced when compared with those before treatment（P＜0.05）， and the above scores in the trial group were lower than those in the control group（P＜ 0.05）. The endometrial thickness of the two groups was thickened when compared with that before treatment（P＜0.05）， and the endometrial thickness in the trial group was thicker than that in the control group（P＜0.05）；the three uterine dimensions and the residual area of retained products in the two groups were decreased when compared with those before treatment（P＜0.05），and the three diameters of uterus and the area of retained products in the trial group were less than those in the control group（P＜0.05）. The RI and PI in the two groups were down-regulated when compared with those before treatment，and the RI and PI in the trial group were lower than those in the control group（P＜0.05）；the PSV and EDV in the two groups were elevated when compared with those before treatment（P＜0.05），and PSV and EDV in the trial group were faster than those in the control group（P＜0.05）. The curettage rate was 2.17%（1/46）in the trial group， lower than that of 13.04%（6 / 46）in the control group（P＜0.05）. Conclusion： Modified Shenghua Decoction can improve the curative effect on retained products of conception with qi deficiency and blood stasis syndrome，relieve symptoms，reduce uterine contraction pain，promote the uterine involution，improve uterine blood circulation，and reduce the curettage rate.