This standard specifies the method of using oil test strips to inspect the degree of degreasing of steel parts before painting. This method uses oil test strips to detect whether there is residual grease on the surface of steel to ensure the cleanliness of the surface before painting. The standard provides the use steps of oil test strips and the judgment basis of test results to ensure that steel parts have good adhesion and coating mass during the painting process. This method is suitable for pretreatment inspection of various steel parts, which helps to improve the painting effect and coating durability.