Abstract: While mentioning the principle of the economical thought,we usually think that it is a typical epistemological proposition of the empirical criticism just like "the theory of the principle with the same pattern".In reality,the principle of economical thought has momentous significance of the scientific methodology.It will greatly influence the contemporary natural scientists.attitudes toward epistemology.The article attempts to discuss and analyze the significance of the scientific methodology of this proposition so that we may have full knowledge of this proposition.