Abstract:The concept of induced ordered weighted geometric averaging(IOWGA) operator is introduced in this paper,and a new dam safety monitoring combination forecasting model based on IOWGA operator is put forward. In this combination model,each single forecasting model is endowed with weights orderly according to its prediction accuracy in each point. Case study shows that the proposed combination forecasting model is superior to the traditional weighted arithmetic averaging combination forecasting model and each single forecasting model. It has high prediction accuracy and it is effective and credible as well in prediction of dam safety monitoring.