Base on the provincial export data from 2002 to 2008,we take advantage of Hausmann(2005) model to estimate metal industry's technology content of export structure from sub-industry and provincial level of 29 provinces,moreover we use Kernel test to analyze the distribution of them.Then we use dynamic OLS model of Kao&Chiang(2000) to study the effect of processing trade on the technology content of export structure from five aspects.The result show that the majority of the provinces which have higher metal product export technology are eastern developed provinces and the export technology in middle provinces which have higher metal product export technology are eastern developed provinces and the export technology in middle provinces is relatively lower,that China's metal industry's technology content of export structure increases quickly but the gap becomes larger between different sub-industries and provinces,and that although processing trade enhances the export technology structure of metal products of China,its effects are different between different sub-industry and provinces on export technology structure evolution.It has polarized effect on metal industry's technology content of export structure.