Abstract: The article which illustrates the comparative analysis and the method evaluation between the results of standard methods and the two online multi-parameter water quality analyzers.The results show that the parameters such as temperature, salinity, dissolved oxygen, pH and turbidity of the two water quality analyzers have good relativity to the results from standard methods.There are some diversity results from specially appointed factors due to the difference between principles of methods, interference factors, methods of sample collection and so on.Online multi-parameter water quality analyzers can be used for operational works because the ability of high frequency continuously monitoring, it is an essential supplementary to traditional methods.