The Analysis Method Based on Ash - Composition is a new method in coal - accumulating environment analy-sis and reconstruction. Principles of the method are that all ash composition comes from the minerals and clasts incoal seams, so it is possible to reversely infer the sorts, contents and grading law of the minerals and clasts of coalseam from the sorts, contents and grading law of ash composition , in advance to judge the coal forming environ-ment. Main points are as follows:rn(1) According to the end - memberanalyze the sort , content and its grading law of clay miner-als and land - source clasts in coal seams , in advance to judge the main direction of trasportion.rn(2) According to the end - member CaO - MgO, analyze the sort and content of calcium - magnesium mineralin coal, in advance to judge the distance between coal- accumulating environment and the marine.rn(3) According to the end- memberanalyze the sort and content of iron mineral (esp. pyrite),in advance to judge the oxidation - reduction condition of coal - accumulating environment.rnThis method was applied in studying accumulating environment of coal seam No. 10rnin Taiyuan Group, He-dong Coal Basin, and achieved satisfactory result, which proved that the analysis method based on ash - composi-tion is a valuable way in reconstructing coal forming environment.%"灰成分端元分析法"是以分别作为三角图端元进行聚煤环境分析的一种新方法。其原理是：灰成分与煤中矿物质种类与含量具有成因上的相关关系--据端元特征，可rn以判断介质的总体运动方向；由CaO-Mgo端元特征，可以判断泥炭沼泽受海水影响的程度；由端元特征，可以判断聚煤环境的氧化还原条件。该方法用于研究河东煤田煤的聚煤环境，收到了良好效果，证明其不失为传统聚煤环境分析方法的一个有益补充。
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