Carbon fibre reinforced polymer (CFRP) has an outstanding characteristics such as high strength, low weight, and high resistance to the temperature, and it exhibits various applications in the field of aerospace, automotive, sporting goods, defence and marine products. For CFRP, drilling of the holes remains the most common secondary machining operation. Despite its widespread use, difficulties such as burring, poor surface quality, poor geometrical features and delamination continue to limit its use. Ultrasonic assisted rotary Electrochemical discharge machining (UR-ECDM) appears as a novel machining technology for drilling holes in composite materials. The present study focusses on the simulation as well as the experimental study of the CFRP in terms of material removal, circularity error (CE), and surface roughness (SR). The multi-spark finite element model is developed to analyze the machinability of the CFRP. The plots of the temperature distribution within the CFRP are utilized to predict the material removal which is further validated using the experimental results. A fair consensus has been noticed between the simulation and experimental results. The effect of various input parameters on response characteristics is also discussed. Results demonstrated that UR-ECDM process can be used to drill holes in CFRP with excellent geometrical features.