Ideal model method, standard state method, reversible process & extremum method and infinitesimal method are basic theoretical research methods, which have been formed with the formation and development of physical chemistry theory systems and played important roles through the whole discipline. In this paper, from the methodological point of view, research purposes, solutions, rules and corresponding conclusions were discussed and summarized. The applications in physical chemistry were also

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... sented. At the same time, it was also addressed that knowing and profound understanding these research methods were beneficial to learners. This will help them to build the physical chemistry knowledge system, to develop clear logical thinking and to solve practical problems. These are important abilities.