GB/T 43354-2023 specifies the plane bending fatigue test method for copper alloy elastic strips with thicknesses ranging from 0.1 mm to 1.0 mm at temperatures between 10°C and 35°C. It clarifies key requirements such as specimen preparation, test conditions, operational procedures, and result processing. The core of the method involves repeatedly bending the specimen to determine its fatigue life and plot an S-N curve, thereby evaluating the material's durability under cyclic stress. The test requires the use of a fixed cantilever constant deflection-type fatigue testing machine (equipped with automatic counting and stop devices), along with high-precision calipers (with a thickness measurement accuracy of 0.001 mm), adjustable torque wrenches, and other instruments. The test frequency is controlled within the range of 5 Hz to 200 Hz, providing a unified technical basis for the research, development, and quality control of copper alloy materials used in electronic components.