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This paper first introduces the background and basic concept of digital twin city, then analyzes the relationship between digital twin city and smart city. Next, it introduces the primary supporting technologies for the construction of a digital twin city, and finally summarizes the current application status and development trends regarding digital twin city. The authors argue that digital twin technology will face challenges in regards to data, basic knowledge base, system integration, and talent issues if it is to be more widely applied in the construction of the smart city. Additionally, the authors propose institutional and technical suggestions for solving these problems at the macro and micro levels.