Abstract: We estimated China-s 31 provinces in 1980~2005 in the construction and equipmen t capital stock by perpetual inventory method (PIM) with the latest data, and th en measured the marginal capital output ratio of China-s various provinces in 19 81~2005 with the GDP data. The capital accumulation in China-s eastern province s has been relatively saturated; Central provinces are at moderate level of capi tal stock; western provinces are still inadequate in capital accumulation and th eir capital efficiency is yet to improve, so they should continue to increase ca pital investment.