Abstract: This paper studies concordance of site sorts divided by main-frequency of pulse and by same-effects velocity of shear-wave for Kunming district.Although results of site sorts divided by two methods are same for many case,but its obvious difference is emerged also.Why is that calculate only stratum which is equal or small than 20m,and it are affected easy by stratums property and by methods and condition of survey.Thus valve of velocity,which lies in purlieus of defining standard especially,could decrease one grade,and yet grade of sites soil is decreased.However the main-frequency of pulse in the site is general response for all stratum under survey place,hence grade of soil divided by main-frequency of pulse is one of building site,consequently results difference defined by two methods are emerged.After having calculated same-velocity and thickness of covering stratum at same,two results is concordance for site sort.According subsistent data formula which is related to same-effects velocity with main-frequency is simulated,y/Hz=0.011 8 x/(ms-1)-0.45.Thereby we believe that is practical for defining grade of building site by main-frequency.