Metal is a material that is widely used in industry. However, it has various weaknesses such as easy to form, high density and not resistant to corrosion, so composite material technology has begun to develop as an alternative material to replace metal. This study aims to determine the tensile strength of the CGlass/epoxy composite structure which refers to the ASTM (American Society for Testing Material) D3039/D3039M standard. The composite specimen manufacturing method used is hand lay-up with variations in the direction of unidirectional fibre 0°, bidirectional WR 0/90°, and WR ±45 ° and the analytical method used from the test results is the Weibull distribution to determine the reliability of the composite material. The results of the analysis show that the tensile strength of the largest to the smallest sequentially is in the C-Glass composite specimen with unidirectional direction of 0°, bidirectional WR of 220 MPa. For fibre direction WR 0/90° is 57.8 MPa and for fibre direction WR 0°/90° and WR ±45°