Abstract: Complex product development is characterized by changeable demand, complex product composition, long technical process and complex and unstable supply chain. Complex product manufacturing is a typical discrete manufacturing. Through the construction of a digital factory, design and manufacturing collaboration, supply chain collaboration, integrated production planning and scheduling, whole process quality traceability, and collaborative optimization of the whole process material flow and information flow can be achieved, thus forming a highly efficient, self-organizing, dynamic, orderly, and continuous production mode. Based on the analysis of the business characteristics of the development of complex products, this paper proposes the overall architecture, application architecture and data architecture of a digital factory based on digital twin technology, and verifies the proposed architecture through two digital factory application scenarios based on model based definition MBD assembly digital process design and advanced scheduling management of production plan.