Traditional combined forecasting methods are mostly for numeric data， but in actual life， the prediction problems are ambiguous， which are usually described by triangular fuzzy number. The conception of firstorder forecasting effective measure based on fuzzy information is proposed， which is used as prediction precision index， and fuzzy combination forecasting model is established by using induced ordered weighted averaging （IOWA） operator to aggregate triangular fuzzy numbers. An example analysis shows that fuzzy combination forecasting model of IOWA operator based on firstorder forecasting effective measure is feasible and effective.