In this study the effect of visible laser 405nm at four exposure times on survival of adults and fourth instar larvae of Tribolium castaneum and Trogoderma granarium as well as the development period of larva to adults were investigated.Results showed that adults of the two pests significantly affected with laser irradiation at all exposure times,there was 100% mortality was observed in adults of T.castaneum at 30 and 40 min respectively compared with control treatment,while 30 and 40 min of laser irradiation caused 70% and 83.3% mortality respectively compared with control treatment in adults of T.granarium. Results also showed that mortality percent of T. castaneum larva was 40%,46.6%,76.6,and 100% at 10,20,30,40 min respectivelly compared with 0% in control treatment,while larva of T. granarium significantly affected with laser irradiation at 20,30,and 40min as mortality percent was46.6%, 53.3%,and 66.6% respectively compared with 0% at control treatment.It has been found that increase in exposure times showed an increase moulting to adults by larva of T. granarium ,the longer period appeared was 22.6 and 23.2 day at 30 and 40 min respectively compared with 17 day in control , there was no adult emergence from the larva of T. castaneum irradiated at all exposure times as pupal recovery was seen but the pupa died and there was no adult emergence. In conclusion the results demonstrate the adverse effects of laser irradiation on the survival of adults and larvae of T.granarium and T. castaneum , the present study suggests the potential for a safe pest-control technique that can easily kill insect pests simply by laser radiating .