Abstract: Based on the analysis on the problems existed in the layout of the traditional observation station and the data processing, a calculation method of the an y direction horizontal moving value was provided.A mining curved surface of the rectangular coal mining face ftting the subsidence and horizontal moving function mod el was established.The paper studied the vertical offset coefficient affected to the main influence radius occurred. The predicted parameters obtained from the curve ftti ng and nonlinear curve ftting were compared and analyzed.The results showed that when the vertical offset cofficient was smaller than a fixed value, the offset occurr ed by the average mining depth replaced to the strike main cross section mining depth would not be over 10% .Otherwise the influence caused by the main influence rad ius should be considered.In comparison with the nonlinear curve ftting, the accuracy of the horizontal moving coefficient in dip and rise direction could be improved by 6.3% and 3.3% individually.The tangent accuracy of the main influence angle was individually improved by 3.6% and 6.0%.The ftting accuracy of the propagation angle coefficient affected by the mining was improved by 13.3%.Thus the ftting results would not be restricted by the mining of the coal mining face.