With the development and commercialization of smart transportation, the road safety of intelligent connected vehicle has attracted much attention. The test and evaluation report are the solid evidence for verifying the safety of ICV. At present, the digital twin test plays an important role for ICV with low-cost and high efficiency, which has become a research hot pot. However, one of challenge of digital twin test is the consistency between the simulation and real-world. In this paper, a solution of digital twins is put forward to reduce the gap of the consistency. Firstly, the digital twin test platform is built, with the construction of automatic digital twin system. Then, a site test is built with a set of evaluation metrics. Finally, the solution is executed under three typical working conditions, and the result shows that the closed-loop simulation test of digital twin simulation platform is feasible, and the consistency is highly achieved. The research and platform provide pattern for the implementation of ICV digital twin test.