Research conclusions: In order to enhance the accuracy of analyzing and determining the corrosion of environment water，first of all，the analysis should be made in time to guarantee the reality and representation of the sampling because some water qualities are changeable．Secondly，the corrosion of environment water mainly relates to the pH value，so42-，CI-，corrosive C02，Mg2+density and total dissolved salts(dissolved salts)，SO the corresponding analysis method，the instruments and configuration solution should be adopted and some special measures should be taken for the different water quality component and concentration range．Selecting the technical parameters for analysis of water quality and grasping the key points of the chemical reaction can guarantee the accuracy of analysis result．The standards for determining the corrosion of environment water for general railway engineering follow the”TemporaryProvision for Railway Concrete Durability Structure Design”．For the special engineering，some additional state standards should be followed except the standard mentioned above to fully and correctly determine the corrosive type and degree．