The 103E QC system is a quality control system that can check whether the online water quality monitoring instrument is working properly and whether the analyzed data is valid. The QC system provides three concentrations of standard reagents for the on-line analyzer under quality control. The concentration of the standard reagents can be selected and transmitted to the analyzer through the local or remote control platform. By controlling the analyzing instrument, obtaining the analyzed data and uploading it to the QC system, the quality control of the analyzing instrument is achieved. Reduce the manual quality control need to go to the scene of the manpower and material investment, the realization of the quality control management of the Internet of things.