The international spread of low-carbon technologies is impacted by the three factors such as the host country's level of economic development, the route of the technical transmission and the absorptive capacity. Through empirical analysis this article found that Import trade is the main way of low carbon technology transfer in China, FDI current are not main route of transmission low-carbon technology; The role of multinational companies on the domestic r&d is nonlinear, can promote low carbon technology transfer under certain conditions in d...