We investigate the effect of energy loss of jets in high energy heavy ion collisions by using a full three-dimensional space-time evolution of a fluid combined with (mini)jets that are explicitly evolved in space-time. In order to fit the pi(0) data for the Au+Au collisions at roots(NN)=130 GeV, the space-time averaged energy loss dE/dx(tauless than or equal to3 fm/c)=0.36 GeV/fm is extracted within the model. It is found that most energy loss occurs at the very early time less than 2 fm/c in the QGP phase and that energy loss in the mixed phase is negligible within our parametrization for jet energy loss. This is a consequence of strong expansion of the system.
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