[Objective] The spatial and temporal evolution of productional-living-ecological functions was studied in order to provide a scientific basis for the construction of new regional land space patterns, implement and supervise territorial spatial planning, and ensure regional food security.[Methods] Functional integration, geographic grid sampling, and spatial coordination degree model methods were comprehensively applied to analyze land use remote sensing data from 1990, 2005, and 2020 in the Huanghuaihai Plain of He'nan Province with regard to the state and coordination characteristics of productional-living-ecological functions in the study area.[Results] From 1990 to 2020, the production and living function indexes increased by 1.30% and 20.83%, respectively, and were characterized as being low in the east and high in the central and east parts of the study area. Over the same time period, the ecological function index decreased by 2.52%. The production service functions were mainly in a relatively balanced state. The shrinking areas were mostly located in the southwest, and the expanding areas were concentrated in the west and the east. The variation of the living function was small, and the spatial distribution was scattered. The spatial variation of the ecological function was strong, with the shrinking area concentrated in the southwest. The expanding area comprised a circular distribution along the northwest, west, and south. The coordination degree of regional land function gradually deteriorated, and the area of middle-high and high-coordination areas were small. The area of low-coordination areas expanded rapidly, and became the most important type of regional land spatial function coordination. The area proportion of middle-low and middle-coordination areas continually decreased.[Conclusion] According to the functional service characteristics of the territorial space in the study area, the development and utilization of the territorial space should be reasonably coordinated and deployed, so as to promote the coordinated development of production, living and ecological functions of territorial space.