Abstract: An analytical method for determination of trace chlorine in coal direct liquefaction products was established by the combination of high-temperature cracking combustion and ion chromatography.When the samples burn in high-temperature cracking combustion furance,the chlorinated compounds in samples transform into HCl or Cl2,which were absorbed by water,then formed chloride solution.Analyse Cl-content using ion chromatography and determine chlorine content in sample.The optimized determination condition is that,the combustion furnace temperature is 1300 ℃,the burning time is 10 minutes,the carrier gas flow rate is 1.5 mL / min,the sample mass range from 0.10 g to 0.16 g.The average recovery rate for chlorine are 106.61 percent and 94.82 percent.The RSD are 3.24 percent and 0.18 percent.Based on the analysis of direct coal liquefaction products chlorine content,obtain distribution information of chlorine content in coal liquefaction products.