Many researchers wrongly take the"five forms" theory early summarized by Marx in accordance with the history of Western Europe for the law of historical development of human society discovered by Marx,but have not seen the change of Marx\'s view which occurs in this question in his old age.

The author gives a review of historical studies in the 20th century and concludes that evolutionism-five-morphological approach is the key link to update the study of the Chinese ethnohistory in the 20th century and macro-universality is its basic principle.

On the spanning of “Capitalist Caudium” by undeveloped countries——Correct understanding of Marxist Law of evolution of five kinds of social formations;