GB/T 30507-2014 provides guidelines for sampling and cleanliness determination of particulate contaminants for lubricating oils and hydraulic oil systems for ships and marine technology. Apply to relevant systems, clarify the appropriate sampling location, method and frequency, and ensure that representative samples are obtained. Specify the means of analyzing particulate contaminants in samples, such as particle counting, size distribution measurement. Develop criteria for judging the cleanliness of systems based on test results, which helps to evaluate the contamination status of systems. According to this standard, the cleanliness of lubricating oil and hydraulic oil systems can be effectively monitored, equipment abrasion can be prevented, the stable operation of marine power and hydraulic systems can be guaranteed, and the Reliability of marine operations can be improved.