The generation of partially coherent laser beam directly from a spatial-temporal phasemodulated op ticaal re-sonator is achieved experimentally. Nd∶YAG rod pumped by kryp ton lamp working in continuouswave mode is used in the experiment. The phase modulation is fulfilled by an intra-cavity L iNbO3 electro-optic crystal driven by high volt-age. Both the spatial and temporal coherence are weakened by the modulation, and different conditions coursed different impacts on the spatial and temporal coherence.