The invention provides a traffic control method and system. The traffic control method includes: acquiring object information of target objects in a preset range of a preset direction in traffic crossing, wherein the target objects include vehicles and/or pedestrians, and the object information includes location, traffic speed and traffic direction of the target objects; according to the object information, making statistics on the number of the target objects required to wait at the traffic crossing in the preset direction of the traffic crossing; according to the number of the target objects required to wait at the traffic crossing in the preset direction of the traffic crossing, controlling duration of traffic lights. According to the location, traffic speed and traffic direction of the target objects, the number of the target objects required to wait at the traffic crossing in the preset direction of the traffic crossing is calculated, duration of the traffic lights is controlled further according to the number of the target objects required to wait at the traffic crossing in the preset direction of the traffic crossing, and traffic service efficiency can be thereby improved.