Insects, the predominate life forms on earth, are quite fascinating owing to their vast complexity in behaviour and attributes. The olfaction system in insects is highly advanced with suitable olfactory sensors or receptors in the antennae, maxillary palps etc. that are triggered in response to intra-specific chemicals like pheromones or feeding stimulants. Therefore technique of electroantennogram (EAG) is primarily used for quantitative measurements of general odorants in model organisms like Bombyx mori. Odours/ chemical stimuli play a vital role in life cycle of insects influencing their behaviour and conduct in complex natural ecosystems. Olfaction, one of the key senses controlling insect behaviour, has been a successful pest management strategy. Thus, elaborate understanding of the EAG technique and set up under laboratory conditions is vital to figure out the response of insects to general chemical stimuli and the consequent behaviour. Therefore, this article aims to review the basic EAG instrumentation and parameters with B. mori as a model.