The G‐C‐D model and technical change

A new model called the G‐C‐D model, which is used to measure the technological advance, is built in this paper. The progress in non‐technical elements in Solow's “remaining value” is removed by using the idea, method and modeling technique of grey system theory. So, the difficult technical problem in the measurement of technological advance has been solved to a certain extent. The periodic G‐C‐D model of Henan Province is built in four different periods and the contribution rate of periodic technological advance of Henan Province is measured.