Studies on effects of gamma radiation on different life stages of Callasobruchus chinensis (L.) were carried out ina growth chamber at temperature of 30oC and relative humidity of 70 per cent. Two days old eggs, grubs (seven and twelvedays old) , mature pupae (one day before adult eclosion) along with pigeonpea seeds and four days old were exposed togamma radiation in range of 0- 20 Gy, 0- 40 Gy, 0- 100 Gy and 0- 200 Gy respectively. Complete mortality of two daysold eggs was obtained by exposure to 20 Gy, a dose of 40 Gy and 100 Gy caused 100 per cent mortality in seven, 12 daysold grubs and pupae respectively. The fecundity and fertility of adults decreased with the increase of irradiation dose. Noeggs were hatched after irradiated with 50 Gy, hence 50 Gy was found to be optimum dose to induce sterility. Femalesirradiated at 0 Gy, 10 Gy and 50 Gy were capable to lay eggs upto eight days. Whereas, egg laying of females were restrictedto four days at 150 Gy and 200 Gy.