Abstract: The flame_retardant property of Nomex/Lenzing Viscose FR blended fabric was studied.The blend fabrics with different ratio of the two fibers were determined by the vertical flame test and their flame_retardant property was analyzed by limiting oxygen index(LOI) method.The results disclose that the blended fabric of two fibers have better flame_retardant property than that of pure fabric of each fiber.The advantages of Nomex/Lenzing Viscose FR blended fabric include the enhancing of the flame_retardant property,improvement of the spinnability of yarn,and reduction of cost.