To explain the reasons of influencing public acceptability of congestion pricing from psychological point of view, and reveal the influence law of psychological factors on acceptability, the structural equation model of public acceptability is built with psychological factors social norm, problem perception, personal norm, perceived behavioral control, behavioral intention, perceived effectiveness, equity and freedom. A scale is developed to measure these psychological factors. Single congestion pricing policy and combined measure of congestion pricing to improve transit are investigated by the scale. The default structural model is fitted and estimated by 897 samples of car user. The results show that the explanatory factors for acceptability are not significantly different between two measures, perceived fairness, freedom, personal norm and perceived behavioral control have direct impact on acceptability. The perceived fairness and freedom are the key factors to affect the public acceptability. The model results may provide a basis for managers to increase the acceptability of congestion pricing policy.