Abstract: China has been using the American formula and LOS to analyze the weaving sections of urban expressway all the time,but except that the urban expressway standard is different from American freeway,the operation characteristics,drivers' characteristics and so on are also different from those of foreign countries, so the analyzed result whether or not accords with actual conditions is still a question.The most effective,scientific method is to use the field data of China to calibrate the existing formula,so the field data gathered from the weaving sections of the expressway in Beijing,Shanghai and Guangzhou to calibrate the operation speed formula of weaving sections of HCM2000,U.S.A.Through validation and using calibrated formula to do example analysis,it proves that the result from calibrated formula can reflect actual operation conditions of the weaving sections objectively,thus it has good value for application.In addition,through surveying and studying the situation and conditions of weaving sections in existing expressway system in China,weaving sections are divided into 3 types of configuration,that is typeⅠ,Ⅱ and Ⅲ.