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The objective of this study is to characterize the tensile properties and interfacial adhesion of chopped glass fiber semipreg reinforced polymer composites. Tensile testing was used to investigate the resistance to tension of composites. Differential Scanning Calorimetry (DSC) was also used to determine the thermal behavior of composites. Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) analysis were conducted to determine the microstructure and morphology of the composite polymers. The tensile testing results indicated that the tensile strength and Young's modulus were respectively improved by 23.45% and 53.77% for the CR-6/PA6 but decreased by 36.49% and 11.39% for CR-6/PA6GF30. DSC results revealed that crystallinity of PA6GF30 and PA6 surface of composites specimen was lower than those of PA6GF30 and PA6 specimens. SEM micrographs of CR-6/PA6 and CR-6/PA6GF30 fractured surfaces depicted good adhesion at the interface between CR-6 and injected PA6 or PA6GF30. XRD results showed that PA6 and PA6GF30 have different crystalline forms. The crystallizability of CR-6/PA6 and CR-6/PA6GF30 was promoted by the presence of CR-6. Introduction of glass fiber was shown to be helpful for formation of a more stable α-phase of PA6 and PA6GF30. [ABSTRACT FROM AUTHOR]