GB/T 15822.1-2024 "Non-destructive testing — Magnetic particle testing — Part 1: General principles" is applicable to the detection of surface and near-surface defects in ferromagnetic materials, specifying the general requirements for magnetic particle testing. It clarifies the detection principle, which involves generating a leakage magnetic field at defect sites through magnetization, attracting magnetic particles to form indications. The standard covers core aspects such as surface preparation, magnetization techniques, requirements for detection media, result recording, and interpretation. New additions include multi-directional magnetization techniques and waveform control requirements, with refined safety and environmental regulations. It also defines the format and content of written testing procedures, providing unified guidance for the entire process of magnetic particle testing.