Abstract: Peel strength is the key performance indicator for 3 PE coating, and the repeatability and reproducibility of peel strength test results will be significantly affected by the difference between different test methods and the preciseness of standards. Considering that the procedures of peel strength test specified in the appendixes of the current national and international product standards are too simple and not stringent enough with the test methods varying greatly, the effects of peeling rate, peeling angle, test temperature, peeling length and result evaluation on the results of peel strength test were studied, the value of the test parameters and the specific operating requirements were defined, and suggestions on peel strength test method and failure mode of 3 PE coating were put forward. Based on this research, Test method for measurement of peel strength of multilayer polyolefin coating systems(NACE TM 21420-2018) and pipeline coating test method-Part 2: Peel strength test(SY/T 4113.2-2018) were formulated.