Certificate path length constraint is invalid. 证书路径长度约束无效。
Sub-structure multipath method was used to improve the efficiency of the path construction, and the efficiency of the path construction algorithm was certified by examples. 采用分段的多路径证书路径构造方法，提高了路径构造效率，并通过例子对路径构造算法的效率进行了分析验证。
