Technology diffusion is essential for sustainable development. However, traditional financing faces structural problems in supporting technological innovation and diffusion. Fortunately, greening and digitalisation have become important directions for the financial development. It’s well worth examining whether green digital finance would promote the diffusion of technology among regions. Therefore, this study explores the causal relationship between green digital finance and technology diffusion using the panel data of 35,532 ‘citing city-cited city’ pair observations from 2002 to 2015. Considering different spatial spillover effects of administrative boundaries and geographic distances, it applies and extends the classic spatial Dubin model with a dual-weighted boundary and distance. The main findings of this study are as follows. First, green digital finance shows significant and considerable spatial stimulus effects, particularly in terms of spatial diffusion across cities. A slight cumulative phenomenon is revealed for different technology diffusion durations. Green digital credit, investment, and support have better stimulating effects on technology diffusion. Second, digital economy and market integration are effective mechanism pathways during this stimulating process of green digital finance on technology diffusion. Digitalisation innovation has a better mechanism effect than others. Third, considering the direction of technology diffusion, the diffusion effect from the east-region cities was better than that from the central-west-region cities.

技术传播对于可持续发展至关重要。然而，传统融资在支持技术创新和扩散方面面临结构性问题。可喜的是，绿色化、数字化已成为金融发展的重要方向。绿色数字金融能否促进技术在地区间的传播，值得探讨。因此，本研究利用2002年至2015年35,532个“引用城市-引用城市”配对观测的面板数据，探讨绿色数字金融与技术扩散之间的因果关系。考虑到行政边界和地理距离的不同空间溢出效应，应用和分析绿色数字金融与技术扩散之间的因果关系。使用双加权边界和距离扩展了经典的空间杜宾模型。本研究的主要结果如下。首先，绿色数字金融表现出显着且可观的空间刺激效应，特别是在跨城市的空间扩散方面。不同的技术扩散持续时间显示出轻微的累积现象。绿色数字信贷、投资和支持对技术扩散具有较好的刺激作用。其次，数字经济和市场一体化是绿色数字金融促进技术扩散过程的有效机制路径。数字化创新比其他创新具有更好的机制效应。第三，从技术扩散方向来看，东部地区城市的扩散效果优于中西部地区城市。