Based on counterfactual thinking,taking 192 cities in China from 2006 to 2019 as sam-ples,the regression control method(HCW)is used to empirically test the driving effect of policy syn-ergy on green finance in low-carbon pilot cities and intellectual property demonstration cities.It also focuses on the transmission mechanism of green patent signals in the process of policy synergy affect-ing the development of green finance.The results show that policy synergy can bring significant posi-tive impact on the development of urban green finance,and this conclusion has strong robustness;Whether in terms of quantity or quality,policy synergy can strengthen green patent signals to a cer-tain extent,especially in strengthening high-quality green patent signals.In the process of green fi-nance development driving by policy synergy in low-carbon pilot cities and intellectual property dem-onstration cities,only when the green patent application has a certain level of quality can it play an ef-fective mediating effect of patent signal.
low-carbon pilot cityintellectual property demonstration citygreen financesyner-gistic effectHCW method