Abstract: The basic situation and structure of the 3rd generation TC grate cooler and the 4th generation Sinowalk grate cooler are introduced. After upgrading to the 4th generation grate cooler, the position of air cannon, grate plate travel, operation mode, coal quality and raw material ratio have been adjusted, so that the performance of the Sinowalk grate cooler has been fully brought into play. The clinker granulation is more uniform, the clinker temperature of the grate cooler is between 80℃ and 130℃, the heat recovery efficiency has been significantly improved, as well as the temperature of the secondary air has been raised to more than 1 200℃ and the tertiary air raised to about 900℃.