This paper summarizes the approaches and research progress in the continental deep crust in the hope of providing some better understanding of the petrogenesis and geochemical composition of continental deep crust in China. Five approaches have been widely used to identify the composition of the deep crust. They are (1) Middleor lower crustal crosssections are exposed on the surface due to tectonic lifting; (2) highgrade highgrade metamorphic terranes exposed; (3) deepcrustal xenoliths occurring in volcanic pipes, such as granulite xenoliths; (4) fitting between geophysical deep survey and experiment of physical features of deep rock at high temperature and pressure; and (5) geochemical trace of the rocks from deep crust. The methods to verify the rationality of element abundance are surface heatflow measurements and key element ratios.