This paper constructs China's capital stock, which is used in conjunction with a labor variable to estimate a Cobb-Douglas production function for the Chinese economy. Two panels of data are used - one for capital formation and one for sources of investment finance. Both national and provincial data are used for these two panels, thus giving a total of four capital-stock series. The Cobb-Douglas estimates show that China's total factor productivity was about 3.4 percent in the post-reform years. Productivity of coastal provinces is higher than inner provinces. Among the various sources of investment finance, foreign direct investment is more efficient than state-funded capital stock.