Corresponding to the characteristics of the water turbine structure,a new water turbine fluid visualization system has been developed,using updated computer technology.This system is an important part of the water turbine optimization design.For water turbine parts,such as static guide vane,moving guide vane,spiral cascade,rotator and draft tube,the database,dataprocessing subsystem,functionmode,user interface and drawing editor have been designed and built.They are difficult of complex shape,huge numbers and more optimization design parameters.Adopting the command file tree structure,the system can be easily combine with new function mode.The system has visual graph display function for the fluid characteristics,efficiency,cavitation and flow stability of the water turbine.Combining with optimization calculation and expert analysis system,the system will be more advanced intelligent water turbine design software.