The current JTS 144-1—2010 Port Engineering Load Code puts forward the calculation formula for the ultimate extrusion ice force of sea ice and river ice，but there is no calculation formula for large freshwater lake area in the code.Based on practical projects，this paper makes a comparative analysis of the calculation formulas of the ultimate extrusion ice force in relevant domestic industry codes，and combines with numerical model experiments to conclude that the ultimate extrusion ice force calculated by using the river ice formula of Port Engineering Load Code is small，but by the sea ice formula is large.According to the current JTG D60—2015 General Code for Design of Highway Bridges and Culverts，the ultimate extrusion ice force is basically consistent with the simulated value of the mathematical model.Therefore，the calculation formula in General Code for Design of Highway Bridges and Culverts can be referred to for the calculation of the ultimate extrusion ice force in large freshwater lakes.This study provides a basis for the calculation of the limit ice extrusion force in large freshwater lakes，and provides a reference for the revision of specifications.