Abstract: It's a huge threat of the ground-pressure disaster in the mine to the miners and equipments of the surface and underground.Generally，the mines forecast the ground-pressure disaster by building the monitoring system of ground-pressure.The data is unequal interval in the monitoring of general displacement and stress，so it's difficult to build the reasonable forecast model.The ground-pressure disaster forecasted by building the model of unequal interval grey model in Gaoyang iron mine proves that the forecasting data and the monitoring data by the model are closely fitted and the model is highly accurate.This model can provide a basis for the forecast of ground-pressure disaster.

Key words: Unequal interval, Ground-disaster, Grey model