Abstract: The paper analyzes and discusses the special mixing change of 5# diesel transported at low temperature, combined with the actual batch transportation and the test on wax deposition and/or dissolution. By analyzing the concentration change of contaminated product, pipe wall's wax deposit, wax dissolution process, and growing-out of the tail of mixed section, it is pointed out that the wax deposit at low temperature is a major reason forming mixed section, and the wax deposit temperature of product is a key control index to avoid producing the contaminated product due to wax deposition when the high set point diesel is delivered with the batch transportation at low temperature.