Li Denghai founded Shandong Denghai Seed Co., Ltd. in 2005 and successfully listed on the Small and Medium-sized Board of the Shenzhen Stock Exchange. Its earnings per share and net assets per share ranked 1,370 in 2004 and the first half of 2005. Top ten listed companies.
As the first completer, he obtained 29 new plant variety rights. Since 2002, it has obtained 6 more national invention patents. Since 2005, he has won the first prize of Science and Technology Progress Award of Yantai City and Shandong Province once each; in 2008, he won the 2nd Chinese Talent Award and the 10th China Patent Excellence Award from the Ministry of Agriculture respectively.
Since 1988, 26 self-bred compact and excellent corn inbred lines have been distributed free of charge to breeding units across the country, promoting the development of China's corn breeding industry. In 1996, the Li Denghai Youth Science and Technology Fund was established, with a bonus of 100,000 yuan. In 2000, the "Denghai Cup" Laizhou Ten Outstanding Youth Selection Activity was funded and carried out for 8 sessions so far. In 2007, he donated 200,000 yuan in cash to Laizhou Charity Federation for social welfare undertakings. In 2008, in order to support Sichuan's post-disaster reconstruction, it donated 1.3 million yuan in cash and 1.8 million yuan worth of improved corn seeds.
Li Denghai has been committed to research on corn breeding and high-yield cultivation for a long time. He has engaged in intergenerational breeding in Hainan for 30 consecutive years. The corn varieties he studied have set new high-yield summer corn records in China seven times. In 2005, he set a world summer yield of 1,402.86 kilograms per mu. The record of high corn yield has been maintained to this day. He pioneered compact corn breeding in China, with 52 varieties approved by the state and relevant provinces and cities, and obtained 44 new plant variety rights and 10 patents. He is known as the "Father of China's compact hybrid corn". He has undertaken 41 national, provincial and ministerial level scientific research projects, among which the "Selection and Promotion of High-yielding Corn Yedan No. 13" project won the first prize of the National Science and Technology Progress Award. He established 28 breeding centers and experimental stations across the country and built the largest corn breeding scientific research platform in the country. The high-yield corn varieties he cultivated have been promoted nationwide on a total of 1 billion acres, achieving economic benefits of 100 billion yuan. He is a representative of the 14th and 17th National Congress of the Communist Party of China, a representative of the 8th to 11th National People's Congress, has been awarded many honorary titles such as the National Advanced Worker, and has been named one of China's top ten outstanding youths.