In this paper, three major engineering methods to calculate the crippling stress of column are descried and investigated: the angle method, the Gerard method, and the plate segment method. The Gerard method and the plate segment method are employed to calculate the crippling stress of fuselage stringers, the result shows that the two methods are all conservative, the conservation of Gerard method are above 4%, the conservation of plate segment method are above 11%.The result of Gerard method are more accuracy. To improve the structural effective and reduce the structural gravity, the Gerard method are suggested.