As a revolutionary tool， digital twin technology enables the creation of dynamic virtual replicas of physical assets， processes， or systems， allowing for precise modeling and simulation of complex systems in various fields. With the continuous deepening of its applications， digital twin technology is gradually becoming a crucial support for key decision-making processes. The digital twin system technology for offshore facilities exhibits distinct characteristics due to factors such as the complexity of the marine environment， the high-risk nature of offshore facilities， and the requirements for managing offshore facilities throughout their lifecycle. This study systematically outlines the characteristics of the digital twin system for offshore facilities， summarizes the primary focus areas for testing， evaluation， verification， and validation (TEVV) of these systems， and proposes a suitable TEVV technical framework. This provides a systematic solution for ensuring the quality of digital twin systems for offshore facilities.