Abstract: In order to study the working performance of cast-steel cooling staves at high temperature, the temperature field was investigated by hot test. The strain distribution on the cool face of the stave was studied for the first time by installing strain gauges. The highest temperature on the hot face of the stave was about 600℃, which is lower than the transformation temperature of caststeel. The strain was about-5×10^-4 at the centre of the cool face, while the average strain all around was-3×10^-4. The heat resistance of the cooling pipe was analyzed. It was verified that the cooling pipe was fused well with the stave body, which means no gaps between them. The special yield phenomenon of cast-steel was validated that the strain distribution would be visibly improved after the thermal shock.