[Objective] To explor the possibility of application of conical flask as an evaperation vessel in detecting the content of total dissolved solids in drinking water. [Methods]The conical flask was placed on a electric stoveto dry, and in electric oven to bake until the weight of conical flask was constant, at temperature of 180±3℃, andthen was used to detect the total dissolved solids in drinking water. The comparison between conical flask methodand National Standard Method was made. [Results] The levels of total dissolved solids obtained according to conical-flask method and National Standard Method revealed no significaut differences (P＞0.5). [Conclusion] The detection of total dissolved solids in drinking water by conical flask method was rapid, accurate and practicabel.