In view of the characteristics of spiral groove liquid lubrication noncontact mechanical seal,a mechanical seal control scheme based on fuzzy theory was proposed according to the principle of liquid film seal,in which the film thickness and pumpage were selected as the controlled variables,and the pressure of sealing liquid was selected as the manipulated variable.The fuzzy inference system (FIS) editor in MATLAB software was utilized to design the liquid film seal fuzzy controller.The output results of the proposed control algorithm were verified by experimental data.The proposed control algorithm is effective and can meet the control requirements for liquid film seal.