The planning of urban rail station connection facilities is an important influencing factor to improve the efficiency of urban rail connection, enhance the service capacity of urban rail transportation and expand the scope of passenger attraction. As an important part of the planning of station connection facilities, the refined estimation of the scale of connection facilities is of guiding significance for optimizing the scale of the existing configuration of connection facilities and predicting the scale of future station connection facilities. The connection demand prediction model is constructed to obtain the sharing rate of each connection mode, and the refined land use information of each entrance and exit of the station is integrated with the sharing rate of each connection mode, which is substituted into the integrated scale measurement model of the connection facilities, and the Gao Shengqiao Metro Station in Chengdu is used as an example to quantitatively study the scale of the configuration of the connection facilities of the urban rail station by combining the functional classification of the station's land use and the scale measurement model.