The nature and magnitude of important insect’s pest of Maize crop are described in this book. The need to manage these insect to achieve profitable crop production is stressed. These insect are found all over the world, but the principle and methods employed in studying & managing them are essentially the same, regardless of location. A primary focus is placed on the types of damage of maize insect’s cause to economic crops and how that damage effects field and quality. A second emphasis the environmental & biological relationship of specific insects. Advantages and limitation for each method are discussed. Environmental conditions influencing the extent of damage are also considered. Focus on characterizing the Chilo partellus Swinhoe . The infestation of study is done on different Maize insects during a year. The experiment carrying at N. D. University research farm. In writing certain chapters in this book, this information available for future use. To my colleagues who supplied information and moral support, I am gratefull. I especially want to thanks professor R.C. Sharma & H.M. Singh and Ashok Choudhary.