The present disclosure provides a target intention predicting method including a dataset obtaining step and a calculating and map mapping step.  In the dataset obtaining step, a host positioning dataset of a host vehicle and a plurality target datasets of a target are obtained.  Each of the target datasets corresponds to each of a plurality of time points of a time line.  Each of the target datasets includes a target position and a target velocity.  The calculating and map mapping step includes mapping the host positioning dataset to the map.  The calculating and map mapping step includes mapping the target position of the final time points to the map.  The calculating and map mapping step further includes calculating an updated velocity of the target based on the target velocities and mapping the updated velocity to the map such that a target future position of the target on the map at a future time point based on the updated velocity can be predicted.  Therefore, the target intention can be efficiently predicted.