This paper delves into the innovation and practice of artificial intelligence technology in technology companies. By reviewing the development history of artificial intelligence and analyzing its key technological areas in technology companies, including machine learning, deep learning, natural language processing, computer vision, etc. This article elaborates in detail on the efforts of technology companies in artificial intelligence innovation, such as algorithm optimization and model architecture innovation, and demonstrates the practical applications of artificial intelligence in different industries, including healthcare, finance, transportation, etc., through practical cases. It also analyzes the challenges faced by artificial intelligence technology and looks forward to future development trends.