3) Starting from the endogenous mechanism, the impression of environmental policy or green finance on green know-how innovation of enterprises was studied. Some students have directly or indirectly carried out the analysis research on the impression of environmental insurance policies or green finance on green know-how innovation. They believed that the excellent effect of varied regulatory devices would better replicate the green innovation effect of environmental regulation. Schinas, et al. tried to assemble the export credit score financing mode on the basis of summing up expertise, and applied it to the transformation of existing ships and new green ships.