Abstract: The convenience of urban public traffic is an important manifestation of the level of public transport serv-ices .In order to give a scientific evaluation on the convenience index of urban public traffic ,12 evaluation indexes are se-lected including transfer distance ,transfer coefficient ,bus stops service rate ,transit network density ,etc ,to build an ur-ban public traffic convenience evaluation index system based on four cardinal points including O-D points ,public transpor-tation capacity ,routes and auxiliary facilities ,which influence the convenience indexes of urban public traffic .This paper gives a Vague matter-element model on the public traffic convenience of Chongqing ,and reaches "level 2"as the evalua-tion consequence .The results show that the new evaluation index system is a more helpful way to give an evaluation on the convenience index of urban public traffic ,and the difference between the closeness degree of the actual data and the closeness degree of "level 2"is 0 .0117 ,which gives the optimal evaluation results .