Abstract: Based on well logging response characteristics of gypsum cap rocks in the middle-upper Yangtze region,with geology,well logging,core analysis and logging data,it was established in this paper a logging interpretation model of gypsum cap rock parameters using the core calibration logging method.The gypsum cap rocks in the study region were interpreted and evaluated.A new set of logging identification method suitable for gypsum cap rocks in the Northeast Sichuan Basin was put forward.The qualitative identification and the quantitative evaluation of cap rocks were done,offering important basis parameters for the geophysical prediction researches of cap rocks.