Abstract: Meadow moth is an important pest in agricultural and livestock production in north China,and its life history and law of occurrence and damage are very complicated.It has polyphagia,gregarious,concealment,sudden,fulminant,migratory behavior and other characteristics.Since the founding of China,periodic outbreaks of meadow moth have occurred three times.And it is now in the third damage cycle.Inner Mongolia has a vast territory,complex natural climatic conditions as well as rich and various vegetation types.It is the main source area and disaster area of meadow moth.The paper reviews the morphological characteristics,life habits,law of occurrence,distribution and damage characteristics of meadow moth as well as its situation in Inner Mongolia.And exploration was actively performed in research and application of key technologies for comprehensive prevention and control of meadow moth including prevention and control strategy,using lights for trapping and killing adults,using bamboo bests for attracting predators,and scientific use of drugs in field.