The currently-used 1999 Solid Mineral Resources and Reserves Classification Code has induced some issues due to its absence of geological confidence G. To revise this code means to clarify the two levels of G. In order to meet the UN's 1997 classification framework, G means the exploration stage. Block level shall still be remained in China's system. It is important that the Chinese Code be compared with global codes, and at the same time, be remained stable in its terms.