The standard GB/T 44223-2024 specifies the technical requirements for a dynamic light scattering method Particle Size Analyzer. This standard defines the requirements for the instrument's working principle, performance, environmental adaptability, safety, mechanical structure, etc. It is mainly used for the measurement of particle size and Particle size distribution of nanoscale and submicron particles. The standard covers the complete technical specification from Light source system to Data analysis to ensure the measurement accuracy and Reliability of the instrument. At the same time, the standard stipulates the inspection items and test methods of the instrument, including functional requirements, performance indicators and environmental adaptability, to ensure the effectiveness and Stability of the equipment in practical applications.