As an important tool for deep-well oil drilling, the hanger has been highly valued by the drilling industry. In order to ensure the construction safety, the analysis of the control strength of the hanger and the load calculation are particularly important. In this paper, many mud pumps in land oil fields are mechanical pumps, and the pump speed is difficult to control. The finite element model of the casing head has established using finite element software, and the contact mechanics between the slip and the bush after the tail pipe hanger has seated, which has studied. The mathematical formulas for checking the strength of the hanger slip and the outer casing have deduced. The mechanical analysis and design of the slip of the tail pipe hanger have performed, and the rated load of the liner hanger was calculated. The results show that the final hanging load of the hanger depends on the three factors, which include the casing shell itself, the ultimate weight of the internal hanger and the strength of the casing itself.