Abstract: Carbon fiber reinforced plastics is a kind of high-quality lightweight materials emerged in recent years．They are widely used in the shell parts of the automotive，electronics，electrical appliances and other industries．These parts often have the risk of being hit or dropped in the process of use，therefore high impact resistance is re-quired． In order to deepen the understanding of the impact resistance of short-cut carbon fiber reinforced plastics，the drop impact test was carried out on short-cut carbon fiber reinforced PA66 sheets． The UT ultrasonic morpholo-gy test and SEM cross-section topography test were performed on the damaged fracture． What's more，the effect of carbon fiber content on the damage behavior and impact resistance of plastic sheets was analyzed by comparing the plate impact failure mode and the displacement-impact force curve． The results show that，in addition to the frac-ture and crack expansion of the plastic matrix，the fiber pull-out and fiber fracture occur in the short-cut carbon fi-ber reinforced PA66 sheets． With the increase of carbon fiber content，the impact damage area and crack number
of the plastic plate are notably reduced，The specific energy absorption and impact resistance of the material are both significantly improved．

Key words: carbon fiber reinforced nylon 66, fiber content, impact damage, impact resistance