This paper uses Phase2 software to analyze the deformation and lining structure internal force of the surrounding rock for a circular tun-nel. The secondary lining support timing and the support scheme with 1. 4 safety factor are determined based on the convergence constraint meth-od. The analytical method provides a new idea for the design and improvement of the secondary lining support.%通过 Phase2软件，对圆形隧道开挖过程中围岩的变形和衬砌结构内力进行了分析，确定了满足收敛约束法原理的二衬支护时机和满足安全系数为1.4的支护方案，并给出了其具体的应用步骤，该分析方法为定量设计和改进隧道二衬支护方案提供了新思路。
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