[Purpose/significance] Open government data assessment helps us understand ways to inform open data strategies.Comparison and analysis of these open government data project evaluations can provide reference for organizations, researchers, leaders responsible for implementing open data initiatives, and practitioners involved in open data capacity building activities. [Method/process] Through sorting out six representative open government data evaluation projects in foreign countries, the main characteristics, methods, similarities and differences are analyzed, and on this basis, the enlightenment for China is obtained. [Result/conclusion] Some open government data assessment projects fall into one of the categories of readiness assessment, implementation assessment and impact assessment, while others fall into two of the categories, and each has its own characteristics and shortcomings.In order to form a scientific open government data evaluation system, we should construct a multi-subject structure of evaluation, adopt a qualitative and quantitative evaluation method, formulate appropriate evaluation indexes, and make clear the evaluation objects.