Abstract: The aim of analytical quality monitoring and control in the whole process in laboratories is to control the analytical error within a permitted limit in order to ensure the analytical data within a given confidence level and meet the quality requirements. According to the standards from the geology and mineral industry of "The specification of testing quality management for geological laboratories"(DZ/T 0130—2006), "The specification of investigation and assessment of groundwater pollution" (DD 2008—01)and referring to the related specifications from other industries and considering the problems in practical application, a quality control system for inorganic analysis in groundwater contamination survey was developed. The system from five aspects were discussed in details in this article. The new quality control system has been applied to the inorganic component analysis in groundwater contamination survey project with satisfactory results.