Olfactory cues are used by many Hymenopteran parasitoids to orient to a potential host habitat as well as to a host, so olfactory senses play an essential role throughout the life span of the parasitoids.Volatile materials left behind by herbivorous insects can serve as an indication for the parasitoids in search for the suitable host. The olfactory response and searching behaviour of Habrobracon hebetor (Say) to volatile signal derived from Helicoverpa armigera were investigated in Y-shaped olfactometer. The treatment included the volatile signals from 2rd instar larvae of H. armigera against pure air, 5th instar larvae of H. armigera against pure air, larval wastes against pure air and larval shed against pure air .The data were compared using Chi- square test. The obtained results demonstrated that 5th instar larvae of cotton bollworm in female (Z=2.777, P= 0.0055) and male (Z=2.59, P=0.0094), 2rd and 5th instar larval waste just in female parasitioid irrespectively were (Z=3.163 ,P= 0.0016 ) and (Z= 3.394 ,P=0.0007) could significantly attract parasitoid. Volatile resulting from larval shed in female (Z=0.7625, P= 0.4458) and signal derived from 2rd instar larvae against pure air of H. armigera in female (Z=0.686, P= 0.492 ) couldn’t significantly attract parasitoid. This study shows that this parasitoid use 5th instar larvae, larval waste volatile of H. armigera for host location. Results revealed that larval shed and 2rd instar larvae of H. armigera isn’t useful signal for host location by H. hebetor. This use of olfactory cues by H. hebetor for location of host may be able to be exploited in pest control programs that utilize this parasitoid.