The invention relates an orientated broadcast routing method in bidirectional lanes under the heterogeneous communication radius. The method comprises the steps that 1) a vehicle node periodically broadcasts self state information; 2) the vehicle node receives state information from other vehicle nodes; 3) the vehicle node detects a message of an accident occurring in the lane where the vehicle drives, and the accident message is broadcasted to the direction opposite to the moving direction of the vehicle; 4) after receiving the accident message of the other vehicle node, the vehicle node judges whether the accident message has been received; if yes, further broadcast of the accident message is canceled; and if no, time before the accident message is broadcasted is calculated in a broadcast storm inhibition method, and the accident message and the before-broadcast time are added into a to-be-broadcasted accident message list; and 5) when the before-broadcast time of any accident message in the to-be-broadcasted accident message list of the vehicle node reaches the time of a present vehicle node, the accident message is broadcasted, and is deleted from the to-be-broadcasted accident message list.