A kind of steal body PDC repair technique was introduced. At first, confirm if the steal body PDC bit which has been already used can be repaired. Then, after pretreated to the bit that qualified to repair, heating it at the speed of 8~10 ℃/min, while heating to about 620 ℃, the solder flux which welded the cutters begins to melt, then take down the PDC cuts, put them to 600 ℃ solder flux to keep warm for use. At last, utilize surface hard facing technique to repair the bit. The on-the-spot test proved that there is no obvious difference on the bit quality between the bits after repair and the new one. For example, repairing a piece of 12(1/4) in steel body bit can economize the cost at least 41400 Yuan RMB. Economic benefits are obvious.