Abstract: OBJECTIVE To observe the effect of Siwu decoction in treatment of hidden hemorrhage after PFNA with senile intertrochanteric fractures， and to provide the reference for TCM on the hidden hemorrhage with senile intertrochanteric fractures patients. METHODS Forty PFNA postoperative patients with senile intertrochanteric fractures patients were divided into the treatment group and the control group according to whether taking the decoction. On the basis of conventional anti-infection symptomatic treatment and dietary guidance， the treatment group was also beginning to take Siwu decoction continuously after three days of surgery， taking for 10 d totally. All patients' height， body mass， intraoperative and postoperative overt blood loss volume were observed and recorded. Hemoglobin (Hb) and hematocrit(HCT) were tested and recorded before and after treatment. Red blood cell volume was calculated by Gross equation to evaluate the hidden hemorrhage volume. RESULTS After the treatment， Hb content in the treatment group increased significantly， hidden hemorrhage volume improved obviously (P<0.01)， which was better than that in the control group (P<0.05). CONCLUSION Siwu decoction can improve the hidden hemorrhage of senile intertrochanteric fractures patients after PFNA.