The reliability of the online automatic water quality monitoring system was analyzed by statistical method to the laboratory by using the automatic water quality monitoring system for the main stream of Suzhou River as an example. Compared the temperature, pH, DO, CODMn and NH3-N of the automatic system with those of the laboratory, it could be shown that the data of the automatic water quality monitoring system were up to standard and there was no difference at the significant level of 0. 01. The data from the two methods were highly correlated and the automatic water quality monitoring system of Suzhou River was reliable. During the daily maintenance, the key parts of the automatic system should be cleaned irregularly and the causes should be found out and repaired when some suspicious data appear.%以苏州河干流水质自动监测系统为例,通过与实验室数据之间的统计分析,分析苏州河水质在线自动监测系统数据的可靠性。对比分析自动监测系统和实验室的温度、pH 、DO、CODMn、NH3-N数据,自动监测系统数据合格,在0.01水平上两者不存在显著性差异,2种方法的结果高度相关,苏州河水质在线自动监测系统测定的数据真实可靠。在自动监测系统的维护中,要对系统关键部分进行不定期的清洗,特别是出现较可疑数据时,应及时寻找原因,解决问题。
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