Composite materials have been widely used in aircraft lightning protection, and their protection methods are becoming increasingly mature, but the research onconducted lightning currentat the joint of metal fasteners and composite materials is stillincomplete. Therefore, for the carbon fiber composite materials used for lightning protection of copper mesh, this paper studied the conducted lightning current capacity of a single fastener and the influence of fastener number and connection method on the conducted lightning current effect through lightning test. The test data shows that a single M4 screw can safely conduct 200kA lightning current, while a single M4 blind rivet can safely conduct 50kA lightning current; When the plate connection form is lap joint, the number of M4 screws shall be at least 7; When the plate connection is butt joint, three M4 screws or rivets can safely conduct 200kA lightning current.