Abstract: In order to research the interference and stickiness between different traffic flows, by analyzing quantificational relationship between gap of bicycle group and bicycle flow rate, a computation model for time length of bicycle group is established taking the bicycle quantity as independent variable.Validation is done based on practical survey data for the intersections.Resultsshow that the model is credible.From the model, the time length is computed as long as the bicycle quantity including in the bicycle group is obtained.It can be converted into space length according to demand.