In digital transformation，manufacturing enterprises need to use several digital technologies to interactively innovate their products around user needs in order to achieve agile product development，rapid iteration and efficient on?demand delivery. Meeting user needs is the core goal of digital enterprises. In view of this，two dimensions，namely personalized needs and product life cycle，which are practically relevant to users，were selected to classify manufacturing enterprises. After that，three typical enterprises of different categories，namely，Sany，Tesla and Kutesmart，were selected as case study objects in an attempt to open the "black box" of digital technology integration with manufacturing industry. In order to explain in detail the process and inner mechanism of digital technology to promote the transformation and upgrading of manufacturing industry. It is found that in order to realize the digital transformation and high?quality development of manufacturing industry，enterprises first need to effectively screen and use data. After that，on the basis of which，changes in production methods，business models and organizational structures are carried out. Finally，in the process of change，enterprises should clarify their own positioning and choose different digital strategies according to their own characteristics，so as to finally realize the high?quality development of enterprises. The theoretical framework and research findings provide theoretical support and practical guidance for digital technology?driven high?quality development of manufacturing industry of China.