Confusion science means studying the disorder phenomenon of a system. Confusion science forecasting is the method of finding the rules and order, and the mathematic description by using statistics principle, and finally to grasp the disorder's natural disaster characters. Confusion science forecasting is introduced in this article to approach its application in forest pest-insect disaster management. It enriches the forecasting method and model of forest pest-insect disaster management deepens the forecasting level, expands the forecasting field.