The anionic polymerization of 2-pyrrolidone was carried out by using CS₂/KOH as an initiator-catalyst under various conditions. The effects of KOH concentration, CS₂/KOH mole ratio, temperature and time were examined. The yield of polymerization was determined and the polymerization was derived and inherent viscosity was obtained by using 96% comic. sulfuric acid as a solvent. It was observed that the percent conversion increased as increasing CS₂/KOH mole ratio, but decreased when CS₂/KOH mole ratio was higher than 0.4. The rate of polymerization at 30℃ is similar to that at 50℃but equilibrium percent conversion is higher at 30℃ than that at 50℃. As the concentration of initiator decreased, inherent viscosity of the resulting polymer increased.