This project belongs to the field of green leafy vegetable cultivation technology and variety selection. Letucine likes to be cold and is originally produced in Europe and the United States. It is a major green leaf vegetable variety and export-earning vegetable crop in this city that is mainly eaten fresh and ranks second only to green vegetables. However, due to the lack of excellent varieties with heat and disease resistance and standardized cultivation and processing and production technologies in the region, the city's lettuce industry is facing severe situations such as shortage of varieties, severe diseases, low yield and finished product rates, unstable quality, and reduced benefits. In response to this serious situation, this project starts with breeding excellent varieties with heat and disease resistance, carrying out supporting cultivation and production technology research, and systematically builds a standardized production and processing technology system. After more than ten years of research, it has bred the heat and disease resistance application series of new lettuce varieties that are urgently needed by the market, created product quality standards and production and processing technology operation specifications, and formed a set of safe and high-quality head lettuce ecological cultivation models, with significant economic and social benefits. 1. The three new lettuce varieties in the heat-resistant and disease-resistant application series have been bred. They are the first domestic varieties of the same type in China. They are suitable for cultivation in the hot season of this city and have significant yields and efficiency gains. Among them, ① The wrinkled leaf lettuce variety Shenxuan No. 1 is heat-resistant and highly resistant to downy mildew and soft rot. It produces an increase of 8% compared with the similar domestic main varieties, and has an area share of the same type in this city. More than 15%.② The cotton-leafed head lettuce variety Shenxuan No. 4 is highly resistant to downy mildew and sclerotiorum, is resistant to heat and cold, and has an output increase of 91.9% in summer compared with the similar domestic main varieties ldquo; Lvdierdquo;, and has a similar area share in this city. More than 50%.③ Purple wrinkled leaf lettuce variety Shenxuan No. 5 is highly resistant to leaf scorch disease and soft rot. It is suitable for cultivation in spring and summer in this city, with an increase in yield by 11% compared with similar domestic main varieties, Luosha Hongrdquo; and a late bolting 5 days. 2. A standardized production system for the production and processing technology of lettuce has been systematically established. The standardized technical specifications, local standards for product quality have been created, and a replicable ecological cultivation model has been formed. The technology is leading and the results are remarkable. Among them, ① The production technical specifications have formulated a reasonable annual production stubble model and its variety structure in this city, effectively standardized the technical requirements of all aspects of production and processing, and the overall level of the standards ranks among the leading level in the country.② The product quality pre-packaging standard is formulated for the first time in China. The product specifications and hygiene quality technical indicators formulated are in line with international standards, and the overall level of the standard ranks among the leading level in China.③ The formed safe, high-quality ecological cultivation model with green prevention and control technology, avoidance cultivation technology, trapping technology, factory intensive seedling raising technology, and post-production processing technology as the core content has effectively solved the problems of yield, quality and efficiency in the main lettuce producing areas of this city.④ This series of technical achievements has increased the output level of Jinshan's main producing areas by 36%, the finished product rate by 11%, the use of chemical fertilizers by 28.6%, and the use of pesticides by 20.3%. The green and GAP certified area is 3100 acres, and the product pass rate is 100%., production has achieved a collapse development. This project identified 4 new varieties, awarded 3 local standards, and published 9 papers. The new variety has been widely cultivated and applied in this city, Jiangsu, Zhejiang, North China and other places, with a cumulative planting area of 282,800 acres, of which a cumulative promotion area of 107,700 acres was achieved between 2016 and 2018, with an added output value of 348 million yuan and an added profit of 251 million yuan. From 2016 to 2018, the project's direct new profits were 875,100 yuan, the project's social benefits added output value was 378 million yuan, the new profits were 270 million yuan, and the expenditure was saved by 9.3154 million yuan. The social and economic benefits were significant, which was important to the healthy development of lettuce production in the city and even surrounding areas of the country., ensuring market supply.