Abstract: The characteristic and mechanism of ice force stochastic process (IFSP) are discussed first.IFSP is classified into crushing failure process,bulking failure process and bending failure process according to the failure mode of ice.After spectrum analysis of 37 pieces of ice force vs.time sampling lines in crushing mode,which are selected from the field data of ice force surveyed at the Bohai Sea area,the corresponding spectrum density and its parameters are determined.Through further statistical analysis the relationship between spectrum parameters and ice thickness is established.Based on this results,the stochastic field model of ice force encircling upright column is obtained.The function of statistical field is given through statistical regressive analysis to large amount of field data.The stochastic process of total ice force on upright column and its spectrum density can be conveniently determined from the stochastic field model.