The application of risers in offshore deep waters have been necessitated due to the increase in the water depths. Thus, the number of marine riser segments increase, which also increase the weight of the offshore platform. To reduce the weight of the risers, composite risers are proposed. The material property of composites can be harnessed to develop composite marine risers, which will reduce the weight on the offshore platform. Numerical tools are employed and the system is coupled using ANSYS 19.2 System Coupling tool, ANSYS ACP and ANSYS AQWA. The local design of the composite risers involved 18 layers and an inner liner. Composite materials used include AS4/PEEK, AS4/Epoxy and different configurations were investigated. Other liner materials on the composite risers were also looked at in the study. Hydrodynamic investigations were also carried out using environmental conditions. Results of the local analysis of the riser were applied in the global design on a Truss SPAR Platform in a deep water condition of 2000m water depth. Comparative studies of the composite risers and the steel risers were carried out. From the results of the study, the composite risers local and global designs applied in deep water conditions were satisfactory. Recommendations too were given in line with the industry standards.