Abstract: Partial pipe filled with hot water, oil driving water and comprehensive treatment are used in the commissioning operation of ShiLan Crude Oil Pipeline. In the light of the abnormal condition existed in commissioning operation, the following countermeasures are put forward, (1) if anomalies exist in the open or close of pump discharge valve, it will be needed to check whether the actual state of valve is consisted with the valve signal of setting mode, (2) If there is not flow display in the commissioning operation of liquid pipeline, the flowrate estimation can be employed by the method of pump curve, pig tracking and frictional loss calculation, (3) the slope of pipe and the travelling speed of pig can be estimated by the flow velocity of the fluid at the high points in the pipeline system and (4) "the fluid being still at slack flow state after the high points" is caused by two reasons, that is, the elevation along the pipeline is greatly upward and downward and oil/water interface has not been isolated with cleaning pig, therefore, the effective measures to reduce mixing oil should be taken if they were still in such case. Key words: crude oil pipeline, commissioning operation, abnormal operating condition, countermeasure