In order to accurately understand the applicability of Bridge Weigh-In-Motion (BWIM) technologies in different types of bridges，and therefore to provide a theoretical basis for the selection of BWIM technology，the accuracy and stability of BWIM systems were studied by adopting the most widely used short- to medium-span concrete girder bridges in China. Firstly，beam bridge models with typical cross sections and span lengths were established based on the standard highway bridge drawings，and the dynamic responses of vehicles and bridges under different loading conditions were obtained by means of numerical simulation. Then，the gross vehicle weight and axle weight were calculated by classical BWIM methods and the identification errors were obtained. Finally，the influence of some important factors such as bridge span length，section type，vehicle type，vehicle speed，sensor installation position，road roughness and measurement noise on the identification accuracy was studied based on parametric studies. The research results show that，for gross weight identification，satisfactory accuracy can be achieved by the BWIM technologies investigated under various complex working conditions with different types of bridges and different bridge span lengths and cross sections；for axle weight identification，better identification accuracy is achieved on shorter bridge span lengths and the best accuracy is achieved on hollow slab bridges，followed by T-beam bridges and small box girder bridges. In addition，the deterioration of road roughness and input signal noise may adversely affect the axle weight identification accuracy of the BWIM systems. Therefore，it is of significant importance to maintain the road surface condition and control the input noise in order to obtain the reliable weighing results.