Cutting force arises as a major problem in machining of Hybrid Metal Matrix Composites (HMMCs) using conventional machining owed to the presence of reinforcement materials. Hence a non-conventional machining process namely Abrasive Water Jet Machining (AWJM) is preferred. The objective of this project is to investigate the cutting performance of AWJM on Aluminum HMMCs. The cutting parameters such as pressure, standoff distance (SOD) and feed rate are analyzed based on the L₂₇ orthogonal array and the machining parameters such as kerf angle, SR and MRR were intended. The optimal condition for the better cutting performance was defined by Gray Relational Analysis (GRA). The SOD was the most contributing parameter with 81.74% as determined by ANOVA. The erosion of surface was augmented due to the improved SOD which has been analyzed by SEM. The grooved lines and ploughing materials were occurred due to the presence of reinforcement particulates.