The model test on slatic ice pressure was carried out in low temperature laboratory. Through analyzing the thermodynamic model of ice sheet formation, deriving similarity scale of indoor model test, modeling the true field temperature process. It is confirmed that the maximum ice thickness of test value and site observation value is very nearly the same and the laboratory simulation of ice freezing process is according to natural law through the contrast of ice thickness curves of experimental value and site observation value. From slatic ice pressure curves, we can see that the maximum slatic ice pressure occurs in temperature rising period. When the ice sheet is thinner, the rising rate is faster. Conclusions: 1) The test lasted 387.4h, and the maximum ice thickness is 39.8cm. The simulation of ice freezing process corresponds with the order of nature. The simulation of thawing process is too difficult, owing to Solar Radiation. So the temperature control process need to be improved. 2) The maximum slatic ice pressure occurs in temperature rising period, which relating to temperature rising rate. The slatic ice pressure is larger when the rising rate is faster. The slatic ice pressure reaches to maximum value, when the temperature reaches to 0ºC, and then evanesces quickly.