This paper is a primary study on middle school students'conjecture and hypothesis thinking activity on basis of pedagogy, psychology and theory of modern physics pedagogy.
From the perspective of comparative education, I expatiate and analyze American school Health education curriculum in secondary schools by literature analysis, case analysis, and comparison.
Under the theoretic guidance of pedagogy, psychology and history, this thesis attempts to study the design of middle school history textbooks which have been published since the 1980s.