This document establishes the evaluation principles of scientific and technological research projects in the field of natural science and technology, the classification and evaluation focus of scientific research projects, evaluation content and evaluation procedures, and describes the evaluation methods. This document is applicable to basic research, applied research and development research projects in the field of natural science and technology, as well as scientific research projects with the above attributes, and is used by scientific research project management agencies, undertaking units, evaluation agencies and other relevant parties to carry out scientific research project evaluation activities. The evaluation activities of research projects in other scientific fields and scientific fields intersecting with natural science and technology are used for reference.