Abstract: Sedimentary environments in northeastern Guizhou and its adjacent areas may be divided into the intraplatform supertidal flat-periplatform shoal and shallow-sea shelf basin facies during the early Doushantuoan,and deep-water shelf-bathyal facies also from northwest to southeast during the late Doushantuoan.The Miaohe-type biotas occur in the black shale and siliceous shale in the transitional areas from the late open platform facies to deep-water shelf-bathyal facies.The preceding sedimentary environments are interpreted as the quiet and dysaerobic environments below the maximum wave base,and suspension deposition acts as a main kind of depositional styles.