Objective To use NeuViz 16 screw CT to measure bone mineral density of cancellous of different space position of hip, the reasonable placement of hip screw in the treatment of senile intertrochanteric fracture. Methods 50 cases of patients with intertrochanteric fracture of femur of orthopaedics in our hospital and 50 cases of healthy people were used NeuViz 16 screw CT to scan bilateral hip and measure CT values from the hip screw entry to the femoral head . A quantitative CT bone mineral density of pressure trabecular with higher density of he femoral head and the inner, outer, front and rear five regions was measured. Results The CT value of the femoral head from the entrance to the femoral head of the fracture group was negative. Quantitative CT bone density of PCT in the fracture group and its internal, external, anterior and posterior were respectively (230.72±55.54)、(65.13±25.32)、(38.51±21.98△)、(78.95±25.98* )、( 79.07±19.92* ) mg/cm3 ，and the control group, respectively(297.35±43.32)、(84.21±27.90)、 (70.03±20.71▲)、(99.82±27.31# )、(98.71±29.58# )mg/cm3 . The bone mineral density of PCT of two groups were respectively significantly higher than those of the 4 regions around(P＜0.01) . The bone mineral densities of five regions of the fracture group were significantly lower than those of the control group(P＜0.01). Conclusion Analysis of bone mineral density shows the tissue density of this region from the entrance to the femoral head is lower than that of the soft tissue density, therefore, the placement of the hip screw has no anchoring force. Trabecular bone as the highest density of bone cancellous bone has the most important role of anchor force of hip screw. The top outside of the femoral head, the front and the rear of 3 ranges, the density of cancellous bone was significantly lower than that of the trabecular bone ,which is a risk area for the occurrence of hip screws. Among patients, especially in elderly patients ,there may be severe bone degeneration , choosing the correct position of placing the hip screw can promote the recovery of the fracture, improve the prognosis of patients and has significance to the recovery of damaged function .