Nowadays composites became very popular due to its excellent physical and mechanical properties. Composites are widely used in all the industries like the construction sector, ships, aerospace, automobile etc. One of the most important properties of the composites is a higher strength to weight ratio because of which it is widely used in aerospace parts. Further to improve the properties of the composites microparticles could be added. In this thesis fabrication of glass fiber composites with microparticles in order to improve the mechanical properties such as tensile, flexural, impact strength and hardness by conducting tests such as tensile strength test, flexural strength, impact and micro Vickers hardness test, respectively. Machining of the composites has always been a complex problem in the case of glass fiber reinforced polymer matrix composites because of the laminar nature of the composites. In order to assemble the structural parts made by composites with the help of rivets and joints or nut-bolts, it is necessary to drill the composites to make the hole. During the exit and the entry of the drill bit in the hole, composites undergo severe damages in the topmost layer and bottom-most layer which in turn results in the delamination of the layers. So in this thesis, the drilling process parameters like speed, feed and the weight percentage of alumina microparticles were optimized in order optimize the output parameters like thrust force and delamination factor of the composites. The optimization of the parameters was done according to response surface methodology concept. The optimum values of input parameters are 1213 rpm speed, 0.16 mm/rev feed and 5.2 % wt. % of alumina microparticles. The corresponding optimal parameters for these parameters are 179.4 N thrust force, entry delamination factor 1.12 and exit delamination factor 1.17 with the desirability of 0.838.