参考下这里，8.5最近刚GA，可以选择8.1 https://cn.pingcap.com/tidb-release-support-policy/?_gl=1*1nrwr5l*_gcl_au*MTA5MzI1MjM5Mi4xNzMwNzY1NTI0*_ga*MTcyNDQ5OTg2Mi4xNjg5MzE1NjUz*_ga_3JVXJ41175*MTczNTc5MjA3OS4zMjkuMS4xNzM1NzkyMDkwLjQ5LjAuMjY0ODQ3MTU2*_ga_CPG2VW1Y41*MTczNTc5MjA4MS4xNjYuMS4xNzM1NzkyMDk4LjAuMC4w