Abstract: We present results from a detailed Quantum Monte Carlo study of BEC applied to JILA experiment[Jin et al, Phys Rev Lett 78,764,1997[1]. This is the first Monte Carlo approach (based on Feynman-Kac path integral method) to the above problem where good qualitative agreement is found for both the lowest lying m=2 and m=0 mode. We found an upward shift of the experimental data for m=0 mode around ( is defined as the predicted BEC transition temperature for a harmonically confined ideal gas when