To reduce iteration and maintenance time of Digital Twin （DT） systems as well as evolution cost of DT systems， the potential of integrating Development and Operations （DevOps） methodology into DT systems was explored， and an innovative DT system DevOps practice DT Operations （DTOps） was proposed. A service-oriented system architecture was designed for the specific needs and characteristics of DT systems， thereby enhancing scalability and agility of system， and the infrastructure of DTOps as well as the implementation methods of Continuous Integration （CI） and Continuous Delivery （CD） were provided. In a case study of a gear production line， various stages of DTOps were validated using open-source tools， demonstrating feasibility and convenience of DTOps. Experimental results show that DTOps improves the evolution efficiency by 29.7% and 26.9% compared to monolithic and microservice architectures， respectively. This effect is particularly significant in highly integrated and data-intensive environments， confirming the effectiveness of DTOps in engineering applications.