A large amount of coal or gas with high calorie value is used for the production of lime in rotary kilns.Coal,coke oven gas or natural gas are mixed fired with blast furnace gas in some production lines.At the same time,blast furnace gas and converter gas are low calorie value gas fuels for iron-making process,and the steel industry has been looking for ways to improve the utilization rate of them.In this paper,the utilization status of low calorie value gas in lime rotary kiln is analyzed,and a new utilization method is introduced.