The authors intraluce exhibition centre air conditioning system survey of shenzhen high_new technique science_technology achievement trade fair and application standards performans of inverter controlled centrifugal water chiller, and analyse energy saving principle of inverter controlled water chiller. The authors also discusses inverter governor basic structure consist of rectification mould plate, IGBT mould plate, Vexamine devices, drives mould plate, CPU minute handle implement et al,and controlled principle, controlled process, controlled paris, VSD work principles figure.The performances of VSD centrifugal water chiller especially on energy saving and part load are studied,and the conclusion is given that this VSD centrifugal water chiller can save energy at 33% while theload is 80%, and that the other performances are superior to the normal centrifugal water chiller.