Abstract: Based on the multi data of TEC inversed from GPS observations in Chinese mainland, TEC mapping published by JPL, plasma parameters from Zhangheng-1 satellite, the ionospheric perturbations were analyzed around Yutian M_S6.4 earthquake on 26 June 2020, in Xinjiang Uygur Autonomous Region. Combined with the results for two earthquakes in this region with magnitude larger than 7.0, it is found that the seismo-ionospheric disturbances in Yutian region concentrated 1 week before, mainly with increasing features and local effects, in which some showed simultaneous anomaly at its conjugate region. The comprehensive multi data analysis can improve the distinguishing capability for earthquake-related anomalies, and enhance their reliability. The solar activity and space magnetic disturbances will cause high frequent anomaly occurrence in the global maps, and influence heavily for abstracting the seismo-ionospheric signals. But a case study for solar eclipse on 21 June 2020 induced decreasing TEC anomalies, which is totally different with those related to Yutian earthquake, whatever in region or abnormal state. How to distinguish the seismo-ionospheric perturbations under weak magnetic disturbance condition still need further investigation.

Key words: the 2020 Yutian M_S6.4 earthquake, Seismo-ionospheric perturbation, GPS TEC, JPL TEC mapping, ZH-1 satellite