SiC particle reinforced aluminum metal matrix composite material (SiCp/Al MMCs) has a poor machinability,especially in the machining process of internal threads. Based on analyzing grinding machinability of SiCp/Al MMCs, the helical grinding method of internal threads with a super abrasive grinding wheel is developed and the helical grinding experiments are carried out utilizing an electroplated CBN grinding wheel. The experimental results show that the helical grinding method has the feasibility and flexibility. On the condition of grinding speed vs= 5.86m/s and feed rate vf= 80mm/min, CBN forming wheel presents an excellent grinding performance. A grinding wheel can finish 17 internal threads (M8), of which the quality meets the requirement of 6H thread plug gauge inspection. Meanwhile, the micro morphology of utilized grinding wheel shows that the wheel wear is mainly on the abrasive wear and only a few abrasive grains fall off from the wheel surface. All the experimental results indicate that the helical grinding method using the electroplated CBN wheel is effective in the machining internal threads of SiCp/Al MMCs with high machining efficiency and surfacequality. Thus, this grinding process has a great engineering application value.