According to characteristics about the Industrial Water, industrial water assessment index system is selected and analysed. Expert scoring method is used to determine the importance of each hierarchy. On that basis, we adopt fuzzy preference-selected scheme to assess the agriculture water level. So the problem about how to use mathematic method to analyse and deal with a lot of fuzzy problems of the agriculture water assessment is solved to a certain extent. The final conclusion of the example indicates that fuzzy comprehension evaluation can reflect water utilization characteristic in different areas and can make comprehension evaluation reasonable.