The invention belongs to the field of comprehensive passenger transport hub transportation planning, and aims to ensure the objectivity, the scientificalness and the effectiveness of the evaluation and provide technical support for the aviation hub traffic planning. According to the technical scheme of the invention, the method for evaluating the effect of a complex function interflow vertical crossing system is used for carrying out comprehensive evaluation on the effect of the complex function interflow vertical crossing system based on a grey relational degree method, and specifically comprises the following steps of taking vehicle flow and people flow as two main bodies, and establishing a comprehensive evaluation index system from multiple aspects of efficiency, security and convenience; carrying out comprehensive evaluation on the effect of the interflow vertical crossing system of a service airport hub in a grey relational degree evaluation mode; and determining the goodness of the scheme according to the size of the grey relational degree which is calculated finally, that is, the higher the grey relational degree, the better the scheme. The method is mainly applied to comprehensive passenger transport hub traffic planning.