Temperature responses of plant photosynthesis are increasingly crucial under the climatic warming. This paper provides a new parameterization of the temperature response of a core mechanism of plant photosynthesis, photosystem II efficiency, to not only instantaneous but also middle- to long-term temperature variation, so-called acclimation. The authors provided response functions for each plant functional type, allowing researchers to implement them in their land vegetation models with a biochemical photosynthesis scheme. Using the new parameterization would effectively improve the simulation accuracy of plant responses, including tolerance and resilience, to climatic change. This study has implications for studies on plant physiology, remote sensing (SIF), biogeochemistry, and ecosystem/earth system models.