Abstract: Environmental protection and recycling economy both are the basic policies for China’s scientific development. This paper introduces the methods of dose evaluation in recycle and reuse of four kinds of metal which potentially contain very low levels of residual radioactivity, including steel, aluminum, nickel and copper. It was done based on the exemption principles quoted in GB 18871—2002, and the method recommended by IAEA. The calculation shows reasonable and credible results, and they will be a sound foundation for developing relative national standard, which will play important social and economic benefits after its enforcement.