Objective: Research PFNA - Ⅱ combined with preoperative accurate measurement of senile femoral fracture between the rotor of the clinical application value. Methods: Fifty-two patients with intertrochanteric fractures admitted to our hospital from January 2017 to October 2019 were selected and divided into the traditional group and the measurement group according to the random number table method, with 26 patients in each group. The traditional group could not make accurate measurement before operation, but the measurement group could make accurate measurement before operation. Postoperative follow-up was conducted for at least 6 months to compare The Times of intraoperative X-ray fluoroscopy, operation time, intraoperative blood loss, and TAD, Harris score and improved BADL score of the hip joint between the two groups. Results: The number of intraoperative X-ray fluoroscopy in the measured group was less than that in the conventional group(15.08+/-2.10 vs 19.81±2.21 times, t=7.920, P=0.000). The operation time of the measured group was lower than that of the traditional group(78.46+/-3.68 vs 89.62+/-5.28 minutes, t=8.841, P=0.000). Intraoperative blood loss was less in the measured group than in the conventional group(146.15+/-24.18 vs 163.46+/-22.62 ml, t=2.666, P=0.010). There was no statistically significant difference in TAD values between the two groups(23.73+/-2.49 vs 24.04+/-2.63 mm, t=0.433, P=0.667). There is no interaction between intervention mode and time factor(F=0.362,P=0.698). There was statistical difference in Harris scores between different timepoints before and after the operation, in other words, there was time effect(F=378.110,P=0.000). There was no statistical difference in Harris scores between the 2 groups,in other words, there was no group effect(F=0.874,P=0.354). All the Harris scores of the two groups increased with time, and the increase trend was consistent(39.69+/-3.27,68.27+/-5.06,82.54+/-6.21 points,F=49.333,P=0.000;39.15+/-3.46,67.00+/-4.24,80.84+/-7.12 points, F=53.460,P=0.000) .There was no significant difference in the improved BADL score between the two groups 6 months after surgery(t=0.587,P=0.560). Conclusion: PFNA - Ⅱ combined with preoperative accurate measurement in the application of the elderly femoral fracture between the rotor is safe and effective, not only can shorten the operation time, less intraoperative blood loss and the number of perspective, while reducing the risks of medical radiation.