Abstract: To give reasonable application recommendations of Amustutz′s method (AM) in buckling analysis for embeded pipe, the influential factors and application conditions in evaluation of critical external pressure were illuminated. Statistics on the domestic and abroad engineering sectors of AM′s main influential factors, i.e. radius-thickness ratio, gap ratio and yield strength of tunnel linings were collected. The influences of the three factors on AM′s results were clarified in practical cases. The calculation accuracy of AM′s simplified formulas was compared with that of original formulas, and application conditions were analyzed considering strength failure mode. The application recommendations of AM were given in term of radius-thickness ratio and verified by experiment. It can be concluded that the performance against buckling and anti-external pressure strength should be checked when the radius-thickness ratio is less than 35, and the AM′s original formulas are suggested in the buckling check. The AM′s original formulas are also suggested for ensuring the calculation accuracy when the radius-thickness ratio is 35 to 60, and the AM′s simplified formulas are suggested when the radius-thickness ratio is larger than 60.