GB/T 17250-1998 is a standard for car noise measurement in the field of acoustics. The standard focuses on the measurement of car noise under urban driving conditions. It clearly applies to cars, specifying that the measurement environment needs to simulate the real road conditions in the urban area, covering road types, traffic conditions, etc. Specify the measuring instrument accuracy, the location of the measuring point (such as a specific distance outside the car), and set the driving conditions of the car, such as idle speed, acceleration, uniform speed, etc. Provide a unified method for accurate measurement of car noise in urban areas, help evaluate the noise impact of cars in urban environments, and promote the development of automotive noise reduction technology.