As one of the pioneers of cold extrusion in China, he pioneered the theory of allowable degree of cold extrusion in the world, and took the lead in studying the successful cold extrusion of ferrous metals in China, which produced great economic benefits. He won nine national, ministerial and municipal awards. He founded the Institute of Mould Technology, which made great contributions to industrial production and technological progress. Editor-in-chief of "Compilation of Research and Application Achievements of Mold CAD/CAM Technology", made great achievements in serving the national economy by using mold CAD technology and related technologies. Important achievements have also been made in graphic technology, numerical simulation and artificial intelligence research of mold CAD/CAM/CAE. The doctoral program he led was rated as "A" by the State Council Academic Degrees Committee. The State Education Commission decided to establish a national "Mold CAD Engineering Research Center" on the basis of this research institute. "China pioneered the theory of allowable deformation degree of cold extrusion, and successfully researched the cold extrusion technology of ferrous metal at the earliest; He has presided over the completion of national key projects, scientific and technological key projects of Shanghai Science and Technology Commission, 2 national natural science foundation projects and Ford-China research and development fund projects; China took the lead in introducing the research, development and application of CAD/CAM, numerical simulation technology and artificial intelligence technology into the fields of plastic processing and mold manufacturing. 1983 With the support of Shanghai Jiaotong University and Shanghai Second Light Industry Bureau, Shanghai Mould Technology Research Institute, which integrates scientific research, teaching and production, has completed more than 400 scientific research achievements. Achievements transfer and technical services cover 2/kloc-0 provinces, municipalities and autonomous regions in China and many countries such as the United States, Japan, Germany and Switzerland, involving more than ten industries such as light industry, electronics, machinery, aerospace, automobiles and instruments.

1995, on this basis, the state approved the establishment of China National Mould CAD Engineering Research Center, which successfully explored the road of combining high technology with industrial production at home and abroad; It is the first time to put forward a new mode of international cooperation-* * * to build a joint research laboratory to help enterprises solve specific problems in the research, development and application of high and new technologies. We not only got sufficient financial support, but also learned the high-tech management mode of well-known foreign enterprises and obtained the latest strategic and technical information. More than 30 joint research laboratories and application centers have been established successively, including Ford-Shanghai Jiaotong University C3P joint research laboratory, Swiss FEINTOOL joint research laboratory and American ETA joint software development center. Academician Ruan is an internationally renowned expert in plastic processing and die technology, and a pioneer in the theory and technology of cold extrusion in China. He initiated the theory of allowable deformation degree of cold extrusion at home and abroad, and successfully studied the cold extrusion technology of ferrous metal for the first time. He has written four monographs, including Cold Extrusion Technology, which has made great contributions to guiding and promoting the development of cold extrusion theory and technology in China. He has presided over the completion of national key projects, scientific and technological key projects of Shanghai Science and Technology Commission, two national natural science foundation projects and Ford-China research and development fund projects. Academician Ruan has won many national, ministerial, municipal and international awards.

Academician Ruan supervised more than 40 doctoral students and 8 postdoctoral students, and published more than 200 academic papers.

1994 was elected as an academician of China Academy of Engineering.