The medium-range numerical weather forecast system T213 became an operational one on 1 September 2002 in the National Meteorological Center. As the core of the new system,the global model T213L31 uses some new numerical techniques and time integration scheme,which include the introduction of the semi-Lagrangian treatment of advection,the use of a reduced Gaussian grid,improvements to the model's basic architecture,the application of distributed memory and shared memory parallelization,realizing the running of high resolution model on the computers now available in National Meteorological Center. It is even more important that,T213L31 uses some new physical parametrization schemes with more realistic physical concept,for example,the schemes for radiation,subgrid-scale orographic drag,convection,clouds and land surface parametrization,therefore overcomes a lot of problems that T106L19 suffers and enhances the forecast skill obviously.