Subgrade soil failure due to insufficient strength, weak bearing capacity, excessive deformation and desiccation cracking of problematic soils is commonly observed on the road network, and this leads to huge expenditure in the maintenance and repair of highway projects every year. It is necessary to reduce these engineering problems and economic losses through environmentally and economically friendly methods. Previous studies have shown that randomly distributed fibers can significantly improve various soil properties. However, there is a lack of comprehensive study on the engineering properties of fiber reinforced high plastic clay. Also, limited mechanical models have been proposed for predicting the shear strength behaviour of fiber reinforced clay. In order to investigate these problems, a series of laboratory investigations including compaction, bearing capacity, one-dimensional consolidation, linear shrinkage, desiccation cracking, direct tensile strength, compression tests should be conducted on unreinforced and Coir fiber reinforced Clay. For this study, the soil samples were prepared with different proportions of RBI grade-81 i.e. (2%, 4%, 6% and 8% of soil) respectively. After that the coir fibers in different ratio i.e. 0.5%, 1%, 1.5% and 2% respectively will be added to the sample containing suitable content of RBI grade-81. Then OMC, MDD and CBR values evaluated for these sample.