Abstract: In order to promote the field test assessment and improve the environmental technology assessment in China, the problems of current environmental technology management system were deeply analyzed, and the role of field test assessment in the environmental technology assessment discussed. It was pointed out that the field test assessment was indispensable for performing best availability technology (BAT) assessment and environmental technology verification (ETV). Also, the field test assessment could accelerate incubation of new technologies, and promote environmental technology industrialization. The field test assessment was the key approach to build the environmental technology assessment system, and to improve the environmental technology assessment management level in China.