The impact factors for vehicle load were ever characterized by varied parameters among different countries, and it is now commonly described by the fundamental frequency of the first bending mode for straightened bridges, but there are still no computation formulae proposed for concrete curved bridges. Massive vehicle-bridge interaction analysises are carried out on concrete curved box girder bridges with different span length, curvature radius, section type, span number and boundary conditon, using a validated numerical method. Based on the obtained results, the impact factors for varied effects are discussed, as well as their correlation with parameters of central radius, ratio of bending to torsional rigidity, integral impact coefficient and the fundamental frequency of vertical bending mode. It is indicated that, the impact factor of interal forces, deflection and reaction force are minus correlated with the discussed parameters except for ratio of bending rigidity to torsional rigidity. The impact factors are most closely correlated with the fundamental frequency of vertical bending mode, so it is best suited to characterize the change of impact factors.