Abstract: The key point ofXi Jinping'simportant discourse on investigation and research is the view on investigation and research to be applied to solve the principal contradictions in the new era, it mainly includes the problem theory of finding and solving problems, the key theory of solving main contradictions, the style theory of the success and failure in the cause of the Party and the people, the ability theory reflecting the basic investigation and research ability of the leading cadres, and the methodology of pointing out the path of practice, etc.. Xi Jinping's important discourses on investigation and research contains rich connotations, such as the theoretical guidance of the trend of investigation and research in the new era, the methods and paths of governing the country, and the internal requirements responding to the people's needs for a better life. All of themhas formed a theoretical system of investigation and research with complete content, vivid language, and new era characteristicsthat are conforming to the reality.

Key words: Xi Jinping, investigation and research, problemorientation, the masses