To study the influence of groove area distribution on sealing performance,the diverging T-shaped groove liquid film seal was taken as the research object.By changing the groove region position,three groove structures of outer groove,middle groove and inner groove were formed by machining the groove on the outer,middle and inner parts of the moving ring.The corresponding model was established and the liquid film flow field was numerically calculated.The influence of operating parameters and groove geometry parameters on the sealing performance of three groove structures was discussed.The results show that the groove distribution has a great influence on the sealing performance.Under the same condition,the outer groove shape has strong fluid dynamic pressure characteristics and fluid pumping effect,so it has larger opening force and lower leakage,and the sealing performance is the best among the three groove shapes.Operating parameters and groove geometry parameters have great influence on the opening force and leakage of the three groove shapes.When the thickness of the film is 2 to 5 μm,the depth of the groove is 5 to 9 μm,the number of grooves is 10 to 14,and the divergence angle is 32° to 40°，the better sealing performance can be obtained.