Abstract: Ground anchors are mainly used to anchor the transmission lines or stay wires during the construction of transmission line towers and overhead lines which belong to stress tools and instruments,affecting the safety construction of the whole project.Currently,the calculation of uplift force of ground anchor generally refers to the classical formula in the route construction instruction manual,and uses the soil weight method for verification.However,the drawing in manual shows that the uplift force direction is inclined upward,which is inconsistent with the concept of uplift force in soil mechanics.To avoid potential safety hazard caused by inaccurate calculation results,by using soil weight method in soil mechanics,the limit buried depth was introduced to modify the original classical formula based on the analysis of the classical calculation formula,and the uplift force of the ground anchor was recalculated.Through comparison,it is found that the calculation error of the original classical formula is large under the condition of poor soil quality,which can not meet the verification requirements of the calculation of the uplift force of the ground anchor at the construction site.The modified formula put forward by this paper can be used to calculate the uplift force of the ground anchor of transmission line engineering more accurately.