Epilachna vigintioctopunctata cause heavy threat to brinjal each year. For efficient control of insect pests, study of population dynamics of pests and its natural enemies is very important. Rhynocoris fuscipes is insect predator which is also employed in biological control of insect pests, these are present in agricultural fields as pest control agent. Study on both of them is clearly states the status of them in agricultural fields this will helpful to get better yield of Agri products. In present study the population dynamics of E. vigintioctopunctata and R. fuscipes were studied in brinjal fields of Virudhunagar District. Results revealed that the pest population is more than the predator population in brinjal field which is due to the presence of more suitable habitat.