Abstract: Objective To explore the effect of special plate for tarsal sinus in the treatment of collapsed posterior articular surface fractures of calcaneus. Methods A total of 45 patients(56 feet)with collapsed posterior articular surface fractures of calcaneus who were admitted to our hospital were selected as research objects, and were divided into observation group(23 cases and 30 feet )and control group(22 cases and 26 feet )according to random number table method. The patients in the control group underwent traditional lateral L-shaped incision internal fixation, and the observation group was given a special steel plate in tarsal sinus surgery. The operative time, hospital stay, intraoperative fluoroscopy times and intraoperative blood loss were observed and compared between the two groups. After 3 months of follow-up, the functional recovery conditions of postoperative foot function were compared between the two groups by Maryland Foot Function Scoring and foot scoring of American Orthopedic Foot Andankle Society(AOFAS). The occurrence of postoperative complications was compared between the two groups. Results The operation time and hospitalization day in the observation group were shorter, intraoperative fluoroscopy times and intraoperative blood loss of the observation group were less than those of control group(P<0.05). The Bohler angle and Gissane angle in the two groups were better than those before operation(P<0.05), but no significant differences were found(P>0.05). The excellent and good rate of recovery in foot function in the observation group was significantly higher than that in the control group(P<0.05). The incidence of postoperative complications in the observation group was lower than that in the control group(P<0.05). Conclusion The minimally invasive small incision through the tarsal sinus approach with open reduction and - internal fixation in the treatment of collapsed fractures of the posterior articular surface of the calcaneus has significant efficacy, and better reduction efficacy. Besides, it can reduce intraoperative blood loss, shorten the length of hospital stay and reduce the incidence of postoperative complications.