Insect olfaction is important for insects to detect the food, reproductive partners, oviposition sites, hosts, prey or predators. Sensory neuron membrane protein (SNMP) and Gq alpha subunit (Gqα) were thought to be involved in signal transduction in insect olfaction. In order to make clear the spatial expression pattern of snmp and understand whether Gqα is the direct downstream binding protein of SNMP, semi-quantitative RT-PCR method was used to learn the expression pattern of snmp in antennae, head, thorax, abdomen, legs, wings, proboscis, labial palpus and maxillary palpus of adult Helicoverpa armigera, and yeast two-hybrid technique was used to investigate the relationship between SNMP and Gqα. Semi-quantitative RT-PCR results showed that snmp was expressed not only in the antennae of adult H. armigera, but also in proboscis, labial palpus, maxillary palpus and legs. Yeast two-hybrid screening results showed that Gqα did not directly interact with SNMP. These results suggest that SNMP plays some roles not only in odor detection but also in taste recognition, and SNMP maybe forms a complex with an olfactory receptor (OR) and then binds with Gqα, which needs our further investigation.