Several polysulfone hollow fiber membranes for ultrafiltration were prepared by the dry-wet spinning technique with spinning solutions containing polysulfone in one of the solvents such as N, N-dimethyracetamae and N, N-dimethylformamide using polyvinylpyrrolidone and 2-methoxyethanol as additive and nonsolvent which act as pore forming agent. Water and solvent-water mixture were used as bore coagulant and gelation medium. The principal variables of the spinning process investigated are spinning solution composition, the flow rate and composition of the bore coagulant, the air gap between the spinnerette and the gelation bath, etc. As the performance test, pure water flux, solute rejections, and the cut off molecular weights were measured.