[Purpose/significance]There are serious problems in the quality of opening government data currently, which has caused the dilemma of data value-added utilization. Identifying key data quality issues will help improve the quality of opening data and realize its value. [Method/process]Based on the analysis of the quality problems in the process of opening government data, this paper takes Guizhou Province as an example to conduct a questionnaire survey and in-depth interview on the government opening data quality problems, and uses IPA method to explore the key quality issues of the government opening data. [Result/conclusion]The results show that, the serious quality problems of government opening data are data segregation, data island and data fragmentation, the important data quality issues are data security and privacy protection, and the key quality issues are data fragmentation, data complexity, data normalization and data island. At the end, some suggestions for improving the quality of government opening data are put forward.