Continuous fiber 3D print technology provides small batches and mold needless manufacturing solution that is different from previous technologies. In terms of manufacturing efficiency, mechanical properties, and microstructure integrity, this approach still shows a lot of room for improvement. The purpose of this research is to investigate the effects of infill density, and the number of continuous fiber-reinforced perimeters on strength, modulus, and fracture behavior was investigated. Coupons with a 7.84 vol% carbon fiber and 11.87 vol% infill area give the highest strength (149.3 MPa), which is about 25.7% higher than the specimen with the same fiber volume fraction but only 2.96% vol infill area. Therefore, high infill density allows better utilization of the strength advantages of the fibers. The fracture behavior of the composites obtained by simulation is in accordance with the behavior observed by the experiment, the model is conducive to the independent understanding of the position of continuous fiber and resin in loading and failure. [ABSTRACT FROM AUTHOR]