The second order effect of slender column is easy to be overlooked in structural design. According to the elaboration on "deficiency column method", it is summarized that the second order effect of slender column can be calculated with deficiency column method. Because the second order ef-fect of slender column has nothing to do with the lateral load of the component, the stiffness of the second order effect can be obtained by inputting the axial force of the component, and the internal force of slender column considering the second order effect can be gained by overlaying the stiffness of unit mechanics properties. It's proved through Sap2000.%细长柱的二阶效应在结构设计中容易被忽略。该文通过对“虚柱法”理论的阐述，总结出细长柱可根据“虚柱法”来计算二阶效应：由于细长柱的二阶效应与构件侧向荷载无关，故只需要输入构件轴向压力来得到二阶效应的刚度，并叠加单元力学属性的刚度，就可以得到考虑二阶效应的细长柱内力计算方法。最后通过Sap2000算例得到验证。
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