The suspension of leaf spring, a potential component, is used to reduce unused weight in automobile. The used component reduces around ten to twenty percentage of the un-sprung weight. The use of composites leads to better suspension system with a better ride in automobile. Springs are known for their ability to absorb and store energy. The relationship between the particular strain energy and spring design can be described. The comfortable suspension system is guaranteed by the capacity to store and absorb more strain energy. It is obvious that materials with lower densities and moduli will have higher specific strain energy capacities. The use of composite materials decreases the weight of leaf spring weight without affecting the load. Composite is a very effective substitute material for traditional steel due to the achievement of weight reduction and adequate improvement of mechanical properties. Cost and material strength are taken into account while choosing a material. Leaf steel springs are being replaced with mono-leaf composite springs because composite materials have a higher strength to weight ratio and better elastic strain energy storage capacity than those made of steel. This study uses CATIA software to conduct a finite element analysis of the structural and mechanical characteristics of composite leaf spring suspension on cars and along with their benefits.