Abstract: The thermal property and rheological behavior of nylon-6 were studied using capillary rheometer and differential scanning calorimeter and the hot-press forming temperature of aramid fiber reinforced nylon-6 composite was determined. Then the aramid fiber reinforced nylon-6 composite was prepared and the microstructure and mechanical properties were studied. Nondestructive testing of the composite was also conducted using ultrasonic phased array technology. The results show that the hot-press forming temperature of the aramid fiber reinforced nylon-6 composite was 245℃. The impregnating effect of nylon-6 on aramid fiber was relatively good. No defects were found in the composite by the nondestructive testing. The static tensile strength of the composite was 279.7 MPa and both the dynamic compressive strength and compression modulus increased with the increase of strain rate. The composite showed a brittle failure at a high strain rate.