The range of bi-directional thrust bearing parameters of large pumped storage hydroelectric generators is presented in this paper. The test of performance parameters for bi-directional thrust bearing was done at 3000ton thrust bearing test stand. To get detailed information about the distribution of the oil film thickness, pressure and temperature of the test bearing pads, the characteristics of bi-directional thrust bearing were tested by means of computer data acquisition system. Valuable measurement data were obtained. The results show that bi-directional thrust bearing parameters designed here are reasonable, and reliable to various bi-directional thrust bearing application.