Abstract:The original curve analysis method and normalized variation rate method were applied to analyze the data changes of four earth resistivity stations within 400 km of the epicenter of Maduo MS7.4 earthquake on May 22, 2021. The following results were obtained:1)Before the Maduo earthquake, the data of four earth resistivity stations showed different degrees of anomalous changes, among which the original curve changes of the Maqu NW, Jinyintan EW, Ganzi N10°E, and Lanlongkou EW channels were the most obvious, which manifested hour value jumping changes, accelerated changes in the daily mean values and curve turning changes, as well as trend changes in the monthly mean values of the broken and preserved annual variation patterns;2)The normalized rate curves of Maqu NW, Jinyintan EW, Ganzi N10°E, and Lanlongkou EW all exceeded the threshold before the Maduo earthquake, but their respective normalized rate patterns are different;3)The comprehensive analysis concludes that the anomalous changes in the earth resistivity data of the four stations are related to the gestation and activity of the Maduo MS7.4 earthquake.