Since 2017, China development had entered a new stage of high-quality development, so, Agriculture development had entered the new stage of high-quality development. Agriculture high quality development is to take some measures and methods to make the land produce the maximum output and services to meet people's yearning for a better life and agricultural production services. The theoretical foundations of Agriculture high quality development is the resources use limit by plants, vegetation carrying capacity and critical period of plant resources relationship regulation, which includes space resources use limit by plants, space vegetation carrying capacity and the critical period of plant space resources relationship regulation in soil water and soil nutrient rich regions; soil water resources use limit by plants and soil water vegetation carrying capacity and critical period of plant water relationship regulation in water limited regions, and the soil nutrient resources use limit by plants and soil nutrient vegetation carrying capacity and critical period of plant nutrient relationship regulation. The methods of Agriculture high quality development are to select the best species or variety, determine the suitable initial plant density, and regulate the plant resources relationship in the process of plant growth to make plant grow well and get the maximum yield and benefits to realize the sustainable use of natural resources and the high-quality development of agriculture. In the future, we must strengthen the basic research of agriculture to select the best species or variety, take the suitable initial planting density and determine the resources use limits by plants, the vegetation carrying capacity and the critical period of the adjustment of plant resource relations in different sites, and then take effective measures to get the maximum yield and benefits to realize the sustainable utilization of natural resources and the high-quality development of agriculture.