Purpose of this study is comparison the performance properties of conventional and polyester core yarns produced using different raw material. In this purpose, five different polyester core yarns were produced using five different raw materials (cotton, viscose, modal, bamboo, polyester). In addition to these yarns, five different conventional yarns were produced with the same production parameters for the comparison. These samples were investigated for hairiness, tensile strength and evenness. Core yarn and conventional yarn test results were compared and discussed. According to the test results, the hairiness values of core yarns obtained from viscose, modal and polyester were lower than that of conventional yarns. No significant difference was found between yarn evenness of core yarns and conventional yarns. Also, usage of polyester as a core in core yarns increased tensile strength except modal and polyester yarns.