Abstract: In order to investigate the effect of adjusting the layered pouring height of the inner containment cylinder concrete on the stress state of the steel liner， a scaled experimental model of the containment cylinder segment was designed and finite element analysis was conducted. Based on the numerical results， stress-monitoring devices were arranged on the steel liner， and optimization tests on the layered pouring height of the inner containment concrete were carried out. The results showed that the concrete lateral pressure， tie-rod axial force， out-of-plane displacement of the steel liner plate， and liner strain increased in a stepwise manner with the rise of pouring height and stabilized after completion， indicating a distinct cumulative effect of layered pouring. The measured values of concrete lateral pressure， tie-rod axial force， and liner displacement were all lower than the numerical predictions. The measured strains of the steel liner were in good agreement with the numerical results， and all monitoring points remained in the elastic stage without any sign of plastic development. Under the condition of a single 4.2 m pouring height， the lateral pressure， deformation， and stress state of the steel liner were all within controllable limits， ensuring structural stability and construction safety.