Abstract: Aiming at the characteristics of the unbalanced two-way and one-way distribution of passenger flow in a single transit line, considering capacity limitation in actual operation, a mixed scheduling model for zonal and full-length vehicles was proposed.The model can optimize the total social benefit by simultaneously adjusting the frequency of full-length and zonal vehicles and the location of short-turning.Finally, a numerical example was presented.Using the model, the relationship of the frequency, location of short-turning and cost was analyzed.The result indicates that the mixed scheduling can reduce system costs and travel time compared with the single scheduling in the case of unbalanced passenger flow distribution and capacity limitation.With Less capacity, the proposed model is superior.System cost can be reduced by strategy of mixed scheduling with capacity limitation.There is an optimal capacity allocation which makes the system reach the lowest cost.