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Technology purchasing and in-house R&D have always been the main means for enterprises to improve their innovation performance. However, the existing research ignores the specific mechanism of the impact of technology purchasing and in-house R&D on enterprise innovation. Based on panel data of 1551 high-tech companies in ZGC (2008-2015), this study explores and verifies that there are threshold paths for the impact of technology purchases and in-house R&D on enterprise innovation. The study found that there is an enterprise size threshold for the innovation performance of technology purchasing, and the mediating effect of in-house R&D on technology purchase and innovation performance only occurs within the effective size threshold for technology purchasing. This study contributes to a better understanding of the innovation driven by purchasing through building a theory framework combing firm size, complementarity among innovation resources and threshold effect. [ABSTRACT FROM AUTHOR]