With the deepening of digital transformation in the rail transit industry,QR code technology has become an important tool for connecting different business scenarios and breaking down data barriers due to its high information capacity and wide applicability.It designs an open platform architecture for the one-code pass service by analyzing the scenarios of rail transit.It is recommended that the open platform adopt a business loose coupling model and provide services including identity authentication,code verification,and key management.At the same time,corresponding one-code pass solutions have been proposed to address the unique network free or weak network environment of rail transit and the high concurrency problem during peak hours.These explorations aim to provide a safe,universal,and promotable one-code pass solution and suggestion for rail transit scenarios.