In order to study the post-construction subsidence characteristics of open-cut and buried tunnels in the sand-stick-powder interbedded strata at the edge of the North China alluvial plain and the influence of the groundwater level on the tunnel subsidence, according to the 18 months settlement monitoring data during the construction and operation of the Jingxiong Railway Airport Tunnel 2, by combining with the geological conditions and groundwater level data, the subsidence characteristics and differences of the tunnel were comprehensively analyzed and the Asaoka, hyperbolic and three-point methods were used to predict the final settlement values. The results show that the settlement curves of sand-silt-clay interbedded strata with higher groundwater levels can be divided into three types:hyperbolic-like, U-shaped and oscillatory, and that the settlement values and settlement characteristics of the tunnel are positively correlated with the content of cohesive soil in the main compression layer. When the content of cohesive soil in the main compression layer exceeds 64%, the settlement curve is quasi hyperbolic. Groundwater level height and backfill depth are important factors affecting tunnel settlement, and groundwater buoyancy is the main force of tunnel lifting. The longer data accumulation time, the higher prediction accuracy of curve fitting method. After the 9 months of data accumulation after dead load, the error of final settlement predicted by Asaoka method and three-point method is less than 10%.