The diatom communities of Hejiang River, a branch of Xijiang River, Pearl River basin were evaulated by means of two-way indicator species analysis and detrended correspondence analysis.The diatom indexes of Generic Diatom Index(IDG), Biolog-ical diatom index(IBD), Specific Pollution sensitivity Index(IPS) and Trophic Diatom Index(TDI)were then further used to vali-date the conclusion.According to TWINSPAN, the 38 sampling sites of Hejiang River were classified into 4 types, the quality of ecological habitat and human disturbance were getting worse and worse from community Ⅰto community Ⅳ;the obvious boundaries of four communities existed on DCA ordination diagram , the ecological value of Van Dam showed that water environmental pollution gradually increased from Ⅰto Ⅳ, the controversial samples of 7, 8 and 24 tended to community Ⅲ on DCA ordination diagram. The results indicated that the divided diatom communities can better reflect the ecological quality , in addition, IBD, IPS, IDG can be applied for monitoring and evaluating rivers in Hejiang River .%综合运用TWINSPAN数量分类和DCA排序方法评估了贺江流域硅藻群落，结合硅藻生物指数（ IBD）、硅藻属指数（IDG）、硅藻营养化指数（TDI）和特定污染敏感指数（IPS）对其结果进行进一步验证．结果显示，TWINSPAN 将贺江流域的38个样点分为4组，且群落Ⅰ到群落Ⅳ其生境质量逐渐变得单一，人为干扰程度逐渐加大；划分的四组群落在 DCA排序图上有明显的界限，依据Van Dam硅藻生态指示意义，水环境污染程度从群落Ⅰ到群落Ⅳ逐渐加剧，有争议的样点7、8和24在DCA排序图上也倾向于群落Ⅲ．4种硅藻指数都是显著相关的，但IBD、IPS、IDG在硅藻群落的箱型图中明显呈现出合理的趋势．以上研究表明，划分的硅藻群落较好地反映了贺江流域的生态质量，IBD、IPS、IDG适合于贺江流域生物监测与评价．
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