Green financial bonds are bonds issued by financial institutions to raise funds to support environmentally friendly projects such as renewable energy, energy conservation and emission reduction. The issuers of these bonds are usually banks, insurance companies or other financial institutions. Green corporate bonds are bonds issued by enterprises to raise funds to promote their own environment-friendly projects or sustainable development projects. The issuer of these bonds is the enterprise itself. Green financial bonds and green corporate bonds have different uses. The funds of green financial bonds are mainly used to support the development of environmental protection projects, such as investing in renewable energy projects or improving energy efficiency projects. The funds of green enterprise bonds are mainly used for the environmental protection projects of enterprises themselves, such as improving production technology, reducing waste emissions or improving resource utilization efficiency.