Since the 1970s, China has introduced a large number of maize hybrids or commercial maize from abroad for experiment and application, and some researchers have cultivated a large number of maize inbred lines by using the method of breeding bicyclic lines or using them as the basic materials of selection lines, which has played a huge role in China's maize breeding and production. In this paper, the approaches to application and application achievements of foreign maize hybrids in China were discussed.