In the process of drilling well, the serious problem of the device is erosion abrasion. In order to decrease the damage of the erosion, it is very urgent to find out the reason of the erosion by analyzing and examining the erosion abrasion of the drill fixture. Erosion chamber is the main site of fulfilling the erosion experiment, including samples and clamps. The exiting fixation method of the sample clamp is easy to injury the structure of the sample and the integrity of the surface coating material. In order to solve the problem, a clamp was designed which could be used to clamp four samples at one time in the condition of no injuring the structure of the sample, so the clamping time was greatly reduced. An indexing device was designed aiming at the erosion machine which could be used to finish the erosion experiment on the situation of different samples and different impact angles. The research work has important significance in reducing the injury to the workpiece, improving the efficiency of clamping, adjusting different impact angles conveniently. 