Objective　To provide a basis on operation of distal femoral fracture by measuring screw canal parameters of distal femoral fixation using digital 3D skill and reverse engineering.　Methods　15 adult cases (CT data came from the second affiliated hospital of Inner Mongolia medical college, without knee joint illness, extending from the lower of greater trochanter of femur to the upper 1/3 of tibia, ranging from 18～41 years, averagely 32 years old）were 3D reconstructed, including nail canal digital simulation and fixation.　Results　For 3D model of distal femur, the canal of screws gradually increased. 5 cases were not fit in left and 7 cases in right.　Conclusions　The screw canal, which is less invasive stable system for distal femur, is regular, with the gradually increased length. The parameters of LISS are differ from anatomic features of Chinese distal femur, and the improvement of LISS is necessary.