Unearthed relics easily grow mildew at exhibition sites due to extremely high relative humidity. At the Han Yang Ling Mausoleum, located at Xi’an, China, the relative humidity is around 95%±5% perpetually. The environmental conditions of the 15th burial pit at the Han Yang Ling Mausoleum were investigated digitally and a twodimensional mathematical model of the conservation area of the burial pits relics was established according to certain hypotheses. Air curtain technology was used to isolate the relics from the viewing area. Based on this model, a digital computation was carried out using a standard kε turbulence model and the SIMPLE algorithm. In this investigation, the influence of the inlet velocity and elevation angle to the air curtain isolation performance was studied. This study shows that the appropriate inlet velocity of the air curtain for the 15th pit is 1.5 m/s with an elevation angle of 10 degrees. This study provides basic guidance for creating air curtain isolation and high nitrogenlow oxygen condition in high relative humidity environments. The method is instructive and meaningful for the protection of pit relics.