GB/T 9359-2016 "Basic environmental test conditions and methods for hydrological instruments" standard stipulates the basic environmental test items, parameters, conditions and methods for hydrological instruments in the working and transportation storage environment. The standard is mainly used to evaluate the environmental adaptability of hydrological instruments and ensure their Reliability in actual use. The standard covers the testing requirements for hydrological instruments under different environment conditions, and refers to relevant environmental testing and protection class standards. Through these provisions, the standard provides systematic guidance for the quality control and environmental adaptability assessment of hydrological instruments.