What is the trend of the global solar PV industry? What is the importance of Solar Energy in Renewable Energy? Why shall we invest solar PV industry? What is the impact of Renewable Energy Bill, etc. (Law) and the purchase plan (policy) on the solar PV industry? For this research, we mainly analyze the importance of the investment in solar photovoltaic industry. We realize that energy issues have been significant via the analysis by the report of the World Organization, so we shall solve the energy crisis by energy conservation and the development and use of renewable energy. Moreover, we shall realize how to solve the obstacles of the raw materials in solar energy research and which way to get technical and capital in solar photovoltaic industry practice of states, from that we will understand solar energy and the investment relationship of photovoltaic industry. The research results can help readers understand the importance of solar energy, the investment consideration of solar photovoltaic industry and the characteristics of the global solar market, hoping that the policy tools in our country can be leading and continuing success in the future.