This paper presents the concept of petrological structure in the study of crust- mantle structure. The crust-mantle petrological structure of three regions(Hebei plain, Taihang-Wutai and Eerdnosi) of the North China continent is suggested based on the petrological and geobarometric data of the Precambrian metamorphic rock series, the Mesozoic and Cenozoic magmatic activity, and the upper mantle xenoliths in the Cenozoic basalts, in combination with the geophysical data. and the experimental meaurements of Vp values for the rock samples at high temperature and pressure. It is emphasized that, with the combinative constraints of Vp、 Vs a and petrological structure,one can effectively recognize the difference in composition of the sialic crust among the different regions, and distinguish the upper mantle low-velocity layer from mineral phase transition (spinel or garnet phase).This paper has reached the conclusion that the crust-mantle petrological structure and its evolution are closely related not only to the Archeozoic-Early Proterozoic tectonic-magmatic events, but also to Phanerozoic tectonic-magmatic events and the extent of the reformation, and that the crust-mantle petrorological structure is the important record and evidence for tracing the nature and evolution of the continent tectonics.