Cyclic constrained groove pressing (CCGP) are widely used for the production of an ultra finegrained, Nano/sub microcrystalline structure in industries to compensate the high strength metal plates components used in automobiles. The present paper focus on The mechanical properties in nanostructure Al/Sic composite plate processed by a new technique, cyclic constrained groove pressing (CCGP), were studied using micro hardness tester. Taguchi technique and the analysis of variance (ANOVA) techniques were carried out to investigate the degree of importance of CCGP process parameters i.e. Percentage of Sic, strain rate, number of passes, plate thickness and heat treatment for four different levels. The results indicated that the percentage of Sic factor has a major influence on the hardness of the composite plate, followed by no. of passes, Heat treatment, plate thickness and strain rate. The Taguchi method and the ANOVA technique was an effective tool to predict the degree of importance of the CCGP parameters on micro hardness CGP specimens. In the present study, material selected for the composite preparation used Al 6061 alloy. The chemical composition of Al 6061 alloy is 0.8-1.2 % Magnesium, 0.4-0.8 % Silicon, Max 0.7 % Iron, 0.15-0.40% Copper, Max 0.25 % of Zinc, Max 0.15% of Titanium, Max 0.15 % of Manganese, 0.04-0.35% Chromium and balanced % is Aluminum. Also SiC of particle size 30 to 50 m used as reinforcement. This was melted at 700°C which is slightly more than 30°C above the liquidus temperature. The dispersoid used was SiC particles of size 30- 50µm, fabricate the specimens, in which a vortex was created in the melt of the matrix alloy through a mechanical stirrer coated with aluminite and rotating at 550 rpm. The SiC particles were preheated to 200°C and added to the vortex of liquid melt at a rate of 120 g/min. A small amount of magnesium, which improves the wet ability of the SiC particles, was added along with the SiC.The composite melt was thoroughly stirred and subsequently degassed by passing nitrogen through at a rate of 2-3-l/min for 3 to 4 minutes. The composites