This standard system describes test methods for measuring the resistivity of lithium-ion battery cathode material powders using the four-probe and two-probe methods. Resistivity is a key parameter affecting battery rate performance and energy density. The standard ensures the consistency and comparability of test results by precisely controlling pressure and the state of powder compaction. During the testing process, the core equipment is a four-probe measurement device integrated with a pressure system, thickness measurement system, and resistance testing system, capable of real-time data collection of resistivity changes during powder compression. Additionally, an electronic balance with a division value of 0.0001g is required to accurately measure the sample mass. This method is applicable to various cathode materials, such as lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary materials, providing a unified technical basis for the research, development, quality control, and batch consistency evaluation of cathode materials.