Abstract: This paper introduced the principle of the XG-Ⅰsuspended logging oscillog raph,and discussed the distribution range and variation law of shear wave velocity with the statistic analysis of foundation ground data in Chenggong region of Kunming.The variation law of shear wave velocity accorded with the curve fitting,and by using the curve of the Vs with 020 m depth,we can get the average of the parameter a and b and c,which can be useful and used as a reference for engineering practice.