Ventilation system: It adopts air supply above the dissection table, and there is an exhaust duct installed inside the dissection table. It is led outdoors through underground ducts, and a strong exhaust fan is installed outside. It is equipped with a variable frequency regulator, and the exhaust rate can be adjusted according to working conditions. The innovation of the design is to measure a tilt of 30 degrees inside the dissecting table, with negative pressure suction from both sides of the air vents downward. The suction below the dissecting table is evenly distributed in a laminar flow state, forming a stable and tight air barrier above the dissecting table. The surface air curtain of the barrier can effectively block the diffusion of physical odors outward. The toxic gas is controlled at an extremely low height and will not evaporate and rise, causing the operator's mouth and nose. The airflow is sucked out by the built-in exhaust duct, completely eliminating various odors and quickly purifying the air.