Abstract: This paper describes two types of displaying methods which are used to implement visualization capabilities in the magnetic flux leakage (MFL) testing data analysis system. The first one is curve image which is straight line connecting plotted after the mapping between the pipe actual location and the display screen abscissa and the conversion of magnetic flux leakage data value into the corresponding vertical coordinates of the screen. The curve image also implements the scaling of the graph and drag operation by means of MFL data sampling to guarantee the exact trend of the original MFL data and to improve the efficiency of data analyst. The second one is C-Scan image which is plotted in the form of micro rectangular that is located on display screen by mapping MFL data and pipeline geographical location. It reflects the trend of MFL data acutely in pseudo color on display screen after a series of data processing that includes linear interpolation. According to test results, the two display methods can reflect the defects information of pipeline more intuitively and accurately.