A LED lamp having a good heat-dissipating function includes a thermal radiator of solid metal including a top surface downwardly sloping from a peak point thereof to the border, a plurality of granular bumps raised from the top surface and defining a plurality of flow paths thereamong, a recess curved inwardly from a bottom surface thereof, an eave surrounding the recess and an inner slope located at the inner side of the eave and obliquely upwardly extended from the lowest edge of the eave to the recess, a vapor chamber bonded with the top surface thereof to the bottom surface of the recess, a circuit module bonded with the top surface thereof to the bottom surface of the vapor chamber, and a LED unit mounted at the bottom surface of the circuit module.