The invention discloses a circuit substrate module with a heat radiator and a production method thereof. A circuit substrate is jointed with a bearing seat of the heat radiator and is made of a two-sided copper-coated ceramic plate; a circuit pattern is formed on a copper layer on one side of the circuit substrate; a plurality of first positioning parts are formed on the copper layer on the otherside of the circuit substrate; a plurality of second positioning parts are formed on the bearing seat, wherein the second positioning parts are in one-to-one correspondence with the first positioningparts; the circuit substrate and the bearing seat are oppositely positioned through corresponding first positioning parts and second positioning parts and are subject to the heat treatment; and the circuit substrate is jointed with the bearing seat, so that the circuit substrate is fixed on the bearing seat. The invention can not only reduce the thermal impedance, but also can greatly improve theheat-radiating efficiency, so that the circuit substrate and the heat radiator are favorably and reliably jointed.