Local anaesthetics and opiod combination in epidural infusion provides superior postoperative analgesia,decrease the dose of local anaesthetics and reduces side effects.Bupivacaine and Ropivacaine are the commonly used local anaesthetics,because of their differential blockade of sensory fibres rather than motor fibres.The newer portable elastomeric infusion pump can be used give epidural infusion.The present study was designed to compare the postoperative pain relief by continuous epidural infusion of Bupivacaine with Fentanyl and Ropivacaine with Fentanyl using Elastomeric pump.METHODS :Fifty patients were grouped into two groups of twenty five each in this randomised,prospective study.patients received 60 ml of 0.5% Bupivacaine+ 10 ml of Fentanyl (100 mcg)+180 ml of normal saline in 250 ml of infusion pump or 60 ml of 0.5% Ropivacaine+ 10 ml of Fentanyl (100 mcg)+180 ml of normal saline in 250 ml of infusion pump.Postoperative Pulse Rate,Blood Pressure,Arterial oxygen saturation,Respiratory Rate,Pain score,Sedation score,Dose of Adjuvants needed and Complications were observed.RESULTS : Mean post operative pain score in the Bupivacaine with Fentanyl group was 2 ± 0.29 and have stable hemodynamics compared to Ropivacaine with Fentanyl  group (2.17 ± 0.706) CONCLUSION : By using portable,elastomeric epidural infusion pump for the purpose of postoperative analgesia by continuous epidural infusion of Bupivacaine with Fentanyl provides superior analgesia compared to Ropivacaine with Fentanyl