The basic principle of mixed programming with Fortran and Matlab is briefly introduced.based on the physical properties subroutines of H 2O-LiBr solution complied in Fortran and using the powerful matrix computation and figure drawing and compiling fuction of Matlab,the physical properties computation of H 2O-LiBr solution is visualized,a convenient and effective tool for the heat-dynamics computation and analyse of LiBr absorption refrigeration cycle is supplized.