Abstract: H-k scanning method of receiver function is an important method to study the internal structure of the earth. Since the receiver function does not depend on the source parameters, it can be more accurate to determine the crustal structure below the station. H-k scanning method is simple and efficient, and can be used to obtain the crust thickness below the station and the VP/VS or Poisson's ratio inside the crust. In this paper, the H-k method is applied to the observational seismic data from the portable broadband seismic array in northeastern Guangxi province. The results show that the thickness of the crust varies greatly in this area (28~34 km), and the V_P/V_S (1.801~1.897) or Poisson's ratio (0.277~0.308) in the crust is higher, which is consistent with the fact that the basic and ultrabasic rocks are exposed in the northeast of Guangxi province.