LI Jinghai, chemical engineer, was elected Member of the Chinese Academy of Sciences in 1999. He is a Member of The World Academy of Sciences as well as a Foreign Fellows of the Swiss Academy of Engineering Sciences, the Royal Academy of Engineering (UK), and the Australian Academy of Technology and Engineering, and the Royal Society (UK). He mainly works on the quantified design and amplification of particle-fluid two-phase reaction systems. He established the energy-minimization multi-scale (EMMS) method, which has been successfully applied in complex system simulation and industrial process simulation. In addition, he developed the multi-scale computing model and proposed the concept of mesoscience.