This paper introduced the main equipment, reagents and experimental method when using the high frequency combustion infrared absorption method to do the rapid determination of sulfur trioxide in coal ash,and from aspects such as standard curve, sample weight, quantitative detection limit of the method, accuracy and precision of the method, the determination results were discussed.The results showed that,when the high frequency combustion infrared absorption method was used for determination of sulfur trioxide in coal ash, the pure substance anhydrous calcium sulfate could be used to establish the calibration curve,the relative standard deviations were 0.28% to 2.33%,this method was accurate,simple and rapid.%介绍了高频燃烧红外吸收法快速测定煤灰中三氧化硫时所采用的主要仪器和试剂及其试验方法，并从标准曲线、称样量、方法定量检出限、方法准确度和精密度等方面对测定结果进行讨论。试验结果表明，高频燃烧红外吸收法测定煤灰中三氧化硫时可利用纯物质无水硫酸钙建立校准曲线，其相对标准偏差为0.28％～2.33％，具有准确度好、简单快速等优点。
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