Abstract:The National Agricultural High tech Industry Demonstration Zone, as an important carrier of agricultural technology innovation in China, plays an important role in achieving high-level self-reliance and self-improvement in agricultural technology. However, it faces problems such as weak independent innovation ability, low competitiveness of high-tech industries, and insufficient social investment and financial support. It is urgent to build an open innovation ecosystem with deep integration of the "four chains". On the basis of defining the essence of four chain integration, this article takes Changchun National Agricultural High tech Zone in Jilin as an example to analyze the internal mechanism of four chain integration in agricultural high tech zones. Research has shown that the essence of deep integration of the "four chains" is to promote the convergence of innovative elements and resources through the organic integration of the four chains of industry, innovation, capital, and talent, continuously improving the innovation and competitiveness of regional industries, and forming a sustainable and efficient regional innovation ecosystem. Research suggests that the innovation chain is the driving force for the development of the industrial chain and the foundation for achieving value appreciation in all aspects of the industrial chain. The industrial chain is the carrier for the innovation chain to take root, and the synergy of the innovation chain and the industrial chain is the core of the integration of the "four chains". The capital and talent chains are the support, and the precise allocation of the capital and talent chains around the innovation chain of the industrial chain is the fundamental guarantee, By creating a modern industrial system that integrates the "four chains", it helps to modernize the supply chain of the agricultural high-tech zone"s industrial chain.