Ultra-thin composite laminates of 1.30 mm for making helmet were fabricated by 5-harness satin weave cabon fiber fabric, plain weave carbon fiber prepreg and kevlar multilayered biaxial weft knitted (MBWK) fabric with different areal weight. The stacking sequence were [0°/0°/0°]_T and [45°/0°/45°]_T. The composite laminates were subjected to given drop hammer impacts and then the mechanical property of compression after impact (CAI) was measured and analyzed. The impact damage was assessed subsequently by coupled ultrasound scanner and the damage area was calculated by image analysis software of Image Pro Plus, and the influence of reinforcement, stacking sequence on CAI were investigated. It is observed that reinforcement with [45°/0°/45°]_T could restrain the propagation of crack along the fiber direction, nevertheless, the impact point of laminates was seriously damaged. And the dent depth was smaller with the increasing areal weight of MBWK fabric. Compared with other structures, the ultra-thin composite laminate, prepared with stacking sequence of [0°/0°/0°]_T, bottom layer of carbon fiber prepreg, the middle layer of MBWK fabric and the top layer of 5-harness satin carbon fabric, presented the smallest damage area and dent depth i.e. 225.28 mm² and 0.16 mm respectively, correspondingly the residual compressive strength reaches the maximum of 97.43 MPa and the compressive strength retention rate was 75.72%. It follows that this reinforcement structure exhibits excellent compresion performance after being subjected to drop hammer impact effect.