The increasing number of national high-tech zones (NHTZs) in China has triggered significant changes in land use. Several researchers argued that urban land use efficiency (ULUE) may decrease, due to the so-called “development zone fever”. However, using a super-efficient Slacks-based measure (SBM) model and the Double-difference model, we found that, from the perspectives of scale, factor accumulation, and agglomeration effects, NHTZs policies had a positive impact on ULUE in 285 Chinese cities in the period 2003–2016. In addition, the net ...