This standard is a key method within the series of performance tests for transport packages, used to evaluate the impact resistance of packaging and unit loads under horizontal impact, as well as their ability to protect the contents. The standard specifies the main performance requirements of the testing equipment, the test procedures, and the content of the test report when conducting horizontal impact tests. It includes various specific implementation methods, such as using a horizontal impact test bench (e.g., pneumatic-driven type), an inclined plane impact test bench, or a pendulum test to simulate different horizontal impact scenarios. Through these methods, the reliability of packaging can be systematically assessed when its surfaces, edges, or corners are subjected to horizontal collisions during transportation and handling.