Abstract: Based on the law of wax deposition in crude oil pipelines, the impact of non-identical wax deposition along pipeline is analyzed in the paper.If the inner diameter and length of the pipeline section and the increment of friction losses along the pipeline section are all the same, the effective average wax deposition thicknesses of the pipeline section would decrease with the reduction of length of wax deposition in the pipeline section.The hydraulic average wax deposition obtained from the calculation according to the pressure drop between two pump stations can not describe the actual wax deposition in pipelines, especially at conditions when the pressure drop along the pipeline increases faster, the wax deposition resulted from the pressure drop would exaggerate the severity of average wax deposition in pipelines, but in the same time ignore potential blockage troubles in some pipeline sections.