Abstract:The German philosopher Ernst Cassirer established his prominent role in contemporary philosophical arena with his system of the Philosophy of Symbolic Forms. A thoroughgoing analysis of the system shows that in his thinking there lies potentially a systematic consideration concerning the ideal of psychology as a science, and it is this psychological consideration that both gives his thought its characteristic features and lays down the foundation for his system. Only if with the intellectual and terminological resources from phenomenology and the phenomenological psychology as represented by such figures as Franz Brentano, Edmund Husserl and William James as guiding referential framework can Cassirer's implicit ideal of psychology be thematized explicitly, thus disclosing the possible theoretical realization of the ideal. This explication of Cassirer further establishes the thesis that in this specific way Cassirer, independently and incidentally, provides a logically forceful historical verification of the truth and necessity of the phenomenological approach to psychology.