This paper first constructed a system to evaluate the innovation efficiency of industrial companies within Mainland China.Then,a principal component analysis(PCA) was performed to these indicators for dimensionality reduction,so as to figure out the technology innovation efficiency in these two phases,respectively.Finally,the overall efficiency of industrial companies in different regions was estimated and factorized via data envelopment analysis(DEA).The results showed that:(1)the efficiency of green technology innovation of industrial companies in China was relatively low as a whole,which mainly resulted from pure technical efficiency(PTE).Further,this huge gap continues to expand in these regions.And both PTE and scale efficiency(SE) in central and western regions leave much to be expected.(2)In the first phase of green technology development,when environmental factors were concerned,the efficiency was much lower than that without environmental considerations.Besides,the central and western regions were facing increasingly severe environmental problems,and there was a wide disparity in technology development efficiency among eastern,central,and western regions.(3)In the second phase of green technology commercialization,there were still more rooms for improvement in raising the efficiency of green technology innovation,and the efficiency in eastern,central,and western regions was ranked from highest to lowest.(4)Liaoning,Hebei,Heilongjiang,Xinjiang,Shanxi,Inner Mongolia,Yunnan,and Qinghai should focus on improving their technology;Jilin,Jiangxi,Anhui,and Guangxi should make their efforts to reduce resource redundancy;whereas Ningxia and Gansu should try to solve the above two issues. This paper first constructed a system to evaluate the innovation efficiency of industrial companies within Mainland China. Chen, a principal component analysis (PCA) was performed to these indicators for dimensionality reduction, so as to figure out the technology innovation efficiency in these two phases, respectively. Finally, the overall efficiency of industrial companies in different regions was estimated and factorized via data envelopment analysis (DEA). The results showed that: (1) the efficiency of green technology innovation of industrial companies in China was relatively low as a whole , which mainly occurred from pure technical efficiency (PTE) .Further, this huge gap continues to expand in these regions. Both both PTE and scale efficiency (SE) in central and western regions leave much to be expected. (2) In the first phase of green technology development, when environmental factors were concerned, the efficiency was much lower than that without environmental considerations.Besides, the central and western regions were facing more severe environmental problems, and there was a wide disparity in technology development efficiency among eastern, central, and western regions. (3) In the second phase of green technology commercialization, there were still more rooms for improvement in raising the efficiency of green technology innovation, and the efficiency in the eastern, central, and western regions ranked from highest to lowest. (4) Liaoning, Hebei, Heilongjiang, Xinjiang, Shanxi, Inner Mongolia, Yunnan, and Qinghai should focus on improving their technology Jilin, Jiangxi, Anhui, and Guangxi should make their efforts to reduce resource redundancy; while Ningxia and Gansu should try to solve the above two issues.