In this paper,the receiver functions of the teleseismic waveforms from 2014 to 2016 recorded by 27 fixed seismic stations of Henan Digital Seismic Network,Hubei Digital Seismic Network,and Shanxi Digital Seismic Network were used to obtain the crust thickness and Poisson's ratio of the stations below the 26 seismic stations in the Nanxiang Basin and its adjacent area,which combined with the fracture distribution,seismicity,and topographic features of the area,has reached the following conclusions:(1)The crust thickness of the Nanxiang Basin and its adjacent areas is closely related to terrain change. It shows a trend of thickening from the northeast to the southwest,and the crust thickness is 30-41km.(2)The high value area of Poisson's ratio is located in the vicinity of Fangxian and Xingshan,the value of which is from 0.31 to 0.34. It may be associated with a large number of mafic rocks in the Cambrian-Ordovician,such as gabbro and sulphite. The range of low value is from 0.18 to 0.24,and the area distributes in Shangnan and Xixia,and is related to a large number of felsic rocks. They formed an integrated contact with Cenozoic sedimentary strata in the Nanxiang Basin. From this,it can be inferred that there is a possibility of reflection of seismic rays during the propagation process due to large differences in the medium between the Xichuan and Xixia areas.