Abstract: Bus transfer time threshold can distinguish transfer behavior and secondary travel behavior accurately. It has great significance for improving the accuracy of the transfer time by using IC card data and also affects the urban transport planning and service level of bus. By site survey, the bus transfer modes are classified, and then the impact factors on bus transfer modes transfer time are analyzed. A model for bus transfer time with various influencing factors is established from the microscopic point of view which can validate the accuracy and reliability by survey data. Finally, various types of transfer time thresholds can be obtained using the way of GIS transit network elements.