The national spatial planning system in the new era of ecological civilization has put forward targeted requirements for the baseline control of territorial space. Both of "double evaluation" and monitoring-evaluation-warning of national spatial planning are the embodiment of baseline thinking. In this paper, the inner relationship between "double evaluation" and monitoring-evaluation-warning of national spatial planning was studied based on the "one map" implementation supervision information system ("one map system") of national spatial planning. The path of territorial space control and governance is constructed (1) to study the role and status of "double evaluation" and monitoring-evaluation-warning of national spatial planning in the territorial space baseline control. The connection and interaction between the two are reflected through the construction of "one map system", which builds a linkage between the two for supporting the whole process of territorial space baseline control and governance. (2) It is found that the work of "double evaluation" focuses on the analysis of natural resources endowment and the identification of the current situation of territorial space, while monitoring-evaluation-warning is dynamic and continuous, which focuses on the long-term dynamic monitoring and timely early warning of various spatial elements. Both of them constitute two stages of baseline control. The former is the basis and the latter is the path and means for baseline control. (3) The practice of national spatial planning of Pingdingshan in Henan province confirmed that "one map system" is helpful as well as necessary for supporting "double evaluation" and monitoring-evaluation-warning. On the one hand, the scientificity of the planning compilation could be improved under the support of "double evaluation". On the other hand, the process of planning implementation could also be effectively regulated by sophisticated monitoring-evaluation-warning system. (4) Both of "double evaluation" and monitoring-evaluation-warning are important tools for territorial space baseline control in the new era of ecological civilization. It is necessary to strengthen the organic combination of the two based on the "one map system".