Based on a large number of surface subsidence measured date through the construction the Nanjing area,surface subsidence problems of subway tunnel construction were researched.By usingof linear regression and least square method and introducing two correction factor including which isthe correction coefficient of the settlement groove width and a which is maximum surface subsidencecorrection factor,the important parameters of Peck formula as follow K which is the width of the settlement trough coefficientand which is the loss rate of the underlying solid amendment were corrected.The results were expected to be applicable to the conditions of the Nanjing institute of geology under the conditions of study interval.The results show .Peck formula corrected fits well with the actual test date.