This paper summarizes recent progress in the observation, mechanism, and modeling of land-atmosphere interactions, and demonstrates that existing observational studies have not considered the effects of changes in terrestrial ecophysiology and the atmospheric boundary layer on land-atmosphere fluxes. Consequently, they restrict the parameterization of land surface processes, parameter inversion from satellite remote sensing, and the operational application of the land surface process model. To gain a comprehensive understanding of land-atmosphere interactions and the development of land surface process models, studies on the effects of changes in terrestrial ecophysiology and atmospheric boundary layers on land-atmosphere interactions and the operational application of land-surface process models need to be emphasized in the future. The main tasks to be considered include: \mathrm{①} three-dimensional observation of the land-atmosphere interactions across the boundary layer, \mathrm{②} application of multi-source data in the land-atmosphere interactions across the boundary layer, and \mathrm{③} development and operational application of land surface process models.