Abstract: The United States is the largest producer and exporter of walnuts in the world. It has become one of the most famous walnut producing countries in the world. In order to further study the California walnut advanced science and technology and management experience, based at study visits to the University of California at Davis, University of Missouri at Columbia and other places, in-depth analysis was made of California natural environment and climate characteristics, cultivation history and status quo, walnut asexual breeding technology, cultivation management, harvest and processing technology and industrial development. Combined with the development status of Sichuan walnut, some ideas were put forward about developing cultivars and rootstock selection, planting, scientific and standardized cultivation technology promotion, etc., aiming to provide the scientific basis for the sustainable development of walnut industry in Sichuan.