By analyzing the anomalous evolution of ground resistivity in the Sichuan region before the Luding M_S6.8 earthquake,distinct abnormal patterns were observed at different stages. The key findings are as follows:(1)Long-term trend reversals occurred at Ganzi,Jiangyou,and Hongge stations 1-4.2 years before major earthquakes,with most measurement indicators currently exhibiting a sustained upward trend.(2)Following these long-term trend shifts,Hongge and Jiangyou stations experienced reductions in annual variation in November 2020 and April 2021,respectively.(3)Significant short-term anomalies were detected at Ganzi,Jiangyou,and Mianning stations just before the Luding earthquake,after which these anomalies disappeared and did not recur. In conclusion,long-term trend shifts may indicate an increasing risk of strong earthquakes,while features such as accelerated rises/falls and sudden reversals could serve as more indicative signals in the medium to short term.