Type 30 bayonet was one of the main weapons used by the Japanese army during World War II, and it was widely used from 1897 to 1945 when Japan surrendered. Its overall structure is mainly composed of two parts: the knife body and the knife sheath. The cross section of the bayonet cutter body is a sharp inverted triangle; Blood grooves are milled on both sides of the knife body, which is used to make the blood flow out quickly along the groove after piercing the human body, which is convenient for drawing the knife, reducing the weight of the knife and strengthening the rigidity of the knife body. The right side of the blade body near the hand guard is marked with the manufacturer's mark; The hand guard is a whole piece, with a collar at the upper end and two forms at the lower end: one is the hook type produced in the early days, commonly known as the hand guard hook; The other is that the lower end of the hand guard is straight, mostly for post-production; At the end of the handle is a bird's head metal piece called the handle head, which is a bayonet locking mechanism. End planes are usually marked with numbers and other marks. The upper part of the knife handle is a T-shaped groove, which is used to connect the bayonet seat below the gun barrel. On the right side of the head of the handle is a spring-controlled movable bamboo shoot. When installing a bayonet, bamboo shoots are stuck on the bayonet seat to fix the bayonet. When the bayonet is unloaded, press the round button on the left side of the handle head to make the bamboo shoots get stuck. The shape of the middle part of the handle is divided into two types: the initial shape is arc, which is convenient for hand holding, and the wooden guard plates on both sides are fixed with rivets or screws.