The paper used electric-thermal films in the wall body of building to simulate heat conduction of actual wall, and gained the total heat by heat flow meter on the inner surface of the laboratory walls. gains through the wall was measured.The net radiative heat gains and convective heat gains were calculated by effective radiative method and heat balance method.It discussed the associations of the split ratio of convective heat and radiative heat amount through the wall, ventilation rates of laboratory and the airflow pattern near wall. Results indicated that among the separation of convection radiation,the convection rates were little affect by amount of heat transfer and ventilation times,whereas the airflow pattern greatly influenced the the convection rates .The convection ratios of the wall under the air supply outlet were far higher than that of wall body under air return outlet.