Abstract: Based on the coupling of two-fluid and wall dynamics models,and selection of specific corre-lation combination,a transient simulation code on flow boiling and heat transfer analysis within heated chan-nel is developed.Through benchmark simulation on different flow boiling cases with various inlet parameters transients,capabilities of the code transient simulating flow boiling behaviors is validated.Furthermore,the fluid-wall heat coupling simulation function of the code are tested through case studies on boiling heat trans-fer under different wall heating conditions.Starting from the present basis,the program is expected to be fur-ther developed forwarding to both system analysis and sub-channel analysis codes,which might demonstrate its feature of expansion and prospect of practical applications.