Abstract: This paper studied the credit management of railway passenger tourism group customers based on blockchain technology, and solved the problem of openness and sharing of credit in passenger tourism group customer management.At present, the credit management of railway passenger transport tourism group customersis taken responsible by each railway administration group company (hereinafter referred to as Railway Administration), which is independent and separated.The sharing degree of tourism group customer credit among the management subjects is not high, and there are problems such as repeated approval and authorization, low transparency and so on.Based on the technical characteristics of blockchain decentralization, traceability, tamperability, openness, transparency and intelligent contract, the paper took union chain as the underlying technical framework, applied it innovatively to the credit management of tourism group customers, studied and established the group management chain of railway passenger tourism group customer credit management, and formed the multi-user credit license union chain of Railway Administration and tourism group customers. It establishes the technical basis for the openness and transparent management of tourism group customer credit and implements the optimization of the credit management of tourism group customers.