The evaluations of resources and environment carrying capacity and territorial space suitability ("double evaluations") play a fundamental role in the new territorial spatial planning system, which is crucial for the scientificity of spatial decision-making and the effectiveness of spatial governance. This paper mainly focuses on the territorial space planning at the provincial level. Through applying "double evaluations" in the provincial territorial spatial planning, we aim to find the scientific support and basic requirements, and to summarize the challenges the evaluation faces both in theory and practice. On this basis, we propose a provincial "double evaluations" program, which includes three-dimensional connotation, one relationship, two scales and four levels. Then this paper explores the carrying capacity, pressure and potential of the resources and environment in Zhejiang province. Based on the logical relationship between carrying capacity and suitability, the provincial "double evaluations" is carried out from the scale of county and grid units. It also supports the formulation of provincial territorial spatial planning in four aspects, which are identification of advantages and weakness, the overall planning of special elements, the arrangement of development sequence and the optimization of spatial patterns. This study attempts to provide a feasible, scientific and practical evaluation framework for "double evaluations" at the provincial level, and to provide evidence for spatial pattern optimization, structural adjustment and index decomposition in territorial spatial planning.