In this study, it introduced the process flow of solid state system for the pretreatment of hazardous solid waste in cement kiln. Meanwhile, it analyzed the relationship between the moisture, calorific value and disposal amount of hazardous solid waste and the cement kiln gas, coal, carbon monoxide and nitrogen oxide, to reveal the effect of hazardous solid waste in kiln on energy consumption and nitrogen oxide emissions in cement kiln by practical industrial test. Results showed that the kiln coal feeding is the main reason for the impact of nitrogen oxide emissions, and the kiln coal feeding amount gradually decreased with the increased of hazardous solid waste calorific value. The emission of nitrogen oxide can be effectively decreased by the disposal of overhaul slag and precipitator dust in cement kiln. When the monthly disposal amount of hazardous solid waste is 1 000t, the standard coal consumption of clinker was reduced by 3.21kg/t. In the actual operation process, in order to achieve a disposal capacity of 4t/h without creating a reducing atmosphere，the content of hazardous solid waste chloride ion in the kiln should be controlled below 1% and the alkali content should be controlled below 4%. Under this control index, the average enrichment rate of chloride cycle in kiln system is 51%.