The integration is common phenomenon in human society. It exists extensively in scientific and technical field, management field and some other fields. It is a kind of consciously choosing, purposeful behaviors of people, or sometimes means the result of these behaviors, namely integrated body. Method of the integration (abbreviated as the integration) is a kind of new method to structure the system, and is also the means and effective way to realize technological innovation, system innovation, and management innovation. This article,regarding systematic thought as guidelines, has probed and described the phenomenon, concept and characteristic, basic categories, methods of the integration, management integration and its compatibility and relationship.