The integration and innovation of the fifth generation mobile communication technology (5G) and artificial intelligence (AI) has become an inevitable trend. According to 1772 research papers retrieved from CNKI (China National Knowledge Infrastructure), this paper uses bibliometric method and CiteSpace software to draw knowledge maps to systematically analyze the research trends of Chinese scholars on the integration and development of 5G and AI. It is found that domestic relevant publications have maintained a growing trend since 2015, and research activities have gone through three stages of development: "emerging", "rapid evolution" and "deepening application". Related publications are generated from not only  research institutions of science and technology, but also institutions of social science, media, and business. Related papers can be classified into 11 research directions under three perspective of technology, application and major events. In addition, most institutions conduct research independently without cooperation, while many small and medium-sized cooperation networks have been established among scholars. Based on the analysis, this paper puts forward three suggestions.