Evaluation indicator related to Smart Cities has been researched in the International Electrotechnical Commission, International Intelligent Community Forum, Vienna University of Technology and China Electronics Standardization Institute. This paper proposes an evaluation model for Smart Cities informationalization applications and services according to the concept of leveraging ICT to make a better city infrastructure, public service, society management, environment and industry system. Based on the model, the standard evaluation indicator system and the indicator selection principles are proposed.