Abstract:    The reform of dual-stage fast-tracking green patent system is an exploration of green patent system construction with unique Chinese characteristics, serving as a green booster for the construction of intellectual property power. Based on the data of 17,4491 granted green invention patents in 282 Chinese cities from 2009 to 2019, this paper used the "scope extension - caliber adjustment" improved patent renewal model to calculate the patent value. Then, an intensity differences-in-differences model was used to investigate whether the reform of the dual-stage fast-tracking system can produce the appreciation and incremental effects on green patents. The results showed that the two rounds of system reform can obviously improve the value of green patents, but only have a weak positive impact on the quantity of green patents. In terms of appreciation effect, the secondstage reform is less effective than the first-stage because of the generalization of the application object and the complexity of the preprocess. In terms of incremental effect, the first-stage reform failed to achieve a breakthrough in the quantity of green patents due to limited review resources and quantity provisions; while the second-stage reform benefits from the easing of the application scope, which can produce a small incremental effect of green patents. Further research showed that enterprises are the main actors of the appreciation effect but not of the incremental effect in the dual-stage reform. The "local protectionism" in the reform makes the value of the green patent produced by universities show a downward trend. The heterogeneity analysis showed that institutional reform can better improve the value and quantity of green patents in cities with stronger environmental regulation intensity and higher intellectual property protection level. This paper has provided important enlightenment for deepening the fast-tracking green patent system reform and promoting the cultivation of high-value green patents.

Key words: fast-tracking green patent system, appreciation effect, incremental effect, improved patent renewal model