On the Psychological mechanisms of ambivalent attitude (AA), Cacioppo and Berntson advanced model of evaluation space in 1994, and Priester and Petty proposed GTM (The gradual threshold model) model in 1996, both of which focus on the formation of AA and form the theoretical basis of the internal mechanism of AA, but there lacks in such respects like the representation and resolution of AA, and its impact on information processing. With the more thorough research on AA, we have a growing need of guidance of theories on the psychological mechanism. This article attempts to do some generalization and appraisal about theoretical models of psychological mechanism of AA. Moreover, the current progress in attitude theories and empirical studies provides a possible method for in-depth explanation on the internal mechanism. By virtue of literature research, the article introduces four newly theoretical models associated with the analysis of psychological mechanisms underlying AA, i.e. the model of attitude as object-evaluation association, the meta-cognitive model of attitude, the iterative reprocessing model, the model of distributed connectionist representation and so on. and connected recent empirical findings to analyze and evaluate. For different theoretical hypothesis and construction, the four models on attitude focus differently on representation, formation and resolution of AA. The object-evaluation association model stresses the attitude formation process to analyze how ambivalence generates, and it provides the novel explanation on AA from the scenarios interaction and the diversity of classification, and views that ambivalence is not caused by two kinds of evaluation activated spontaneously, but by the rapid conversion among different assessment classifications. The meta-cognitive model of attitude pays more attention to the analysis how ambivalence is represented in the memory, and it classifies AA into two forms from the angle of meta-cognition of AA: Explicit and Implicit, and it also gives some specifications on Explicit and Implicit conversions concerning attitude change. The iterative reprocessing model emphasizes the role of the analysis of higher cognition processing in solving ambivalence, and it furthers studies with the corresponding neuron-physiological mechanism. The model of distributed connectionist representation puts its focus on building from the momentary scene to analyze the activation and representation of AA, and weakens the di