This paper sets up an analytic model of double surface emission of volatile organic com- pound (VOC) from dry,flat-plate building materials. Based on it,the influence of factors including air change rate,loading factor of materials in the room,mass diffusion coefficient,partition coefficient,con- vective mass transfer coefficient,thickness of mate- rials,asymmetric convective flow and initial VOC concentration distribution in the building material on emission is discussed. The conditions for simplifying double surface emission into single surface emission are also discussed. The model is helpful to assess the double surface VOC emission from flat-plate building materials used in indoor furniture and space partition. This paper sets up an analytic model of double surface emission of volatile organic com- pound (VOC) from dry, flat-plate building materials. Based on it, the influence of factors including air change rate, loading factor of materials in the room, mass diffusion coefficient, partition coefficient, con- vective mass transfer coefficient, thickness of mate rials, asymmetric convective flow and initial VOC concentration distribution in the building material on emission is discussed. The conditions for simplifying double surface emission into single surface emission are also discussed. The model is helpful to assess the double surface VOC emission from flat-plate building materials used in indoor furniture and space partition.