GB/T 42608-2023 is formulated for the safety performance of portable chain saws. Focused rebound test is used to evaluate the risk of rebound of chain saws due to contact with obstacles during use. The standard specifies detailed test conditions, such as temperature and Humidity of simulated working environment, type of wood used for testing. Clarify the accuracy requirements of test equipment, standardize the installation and Operation mode of chain saws. Through specific test procedures, the degree of rebound of chain saws under different working conditions is detected, which provides a basis for chain saw manufacturers to control the safety mass of products and consumers to purchase safe products, and helps to improve the safety of portable chain saws.