In this study

the parameter characteristics of the database including 473 shear wave velocity test results from all over the world were analyzed. After that

the Logistic model was selected to build a new formula to evaluate the probability of liquefaction

considering four conventional parameters: PGA

shear wave velocity

water table and the depth of liquefiable layer. At last

the applicability of the formula under different probabilistic levels was studied and compared with the existing methods. This study shows that the ground vibration intensity is the primary parameter to influence liquefaction estimation. The shear wave velocity of liquefaction layer does not differentiate from the shear wave velocity of the non-liquefaction layer

so it is difficult to meet the basic requirements by using a semplice formula. The methods developed by Andrus and Shi Zhaoji misjudge many obvious non-liquefied points. Those misjudgments breach the existing knowledge and need improvements. The formula developed by this paper conforms to equal distribution of liquefaction points and non-liquefaction points when PL=50%

and the accuracy can reach about 70% in different intensity levels. In summary

this formula provides a reasonable and easy-to-use shear wave velocity liquefaction evaluation method.