At present, the immersed tunnel of Hong KongZhuhaiMacao Link is the longest highway immersed tunnel in the world, which has active fire prevention system and passive fire prevention system. The main technical characteristics of Hong KongZhuhaiMacao Immersed Tunnel are summarized; and then the heat releasing rate, fire frequency, fireproofing rating and fireproofing standards of tunnel components are proposed. According to fire prevention conditions, fire prevention board is used for immersed tunnel segment structure; the rigid fire prevention board and flexible fire prevention board are used for immersed tunnel segment joints.