The analysis shows that sensitivity of voltage-detected program for the existing line distance protection of series compensation is insufficient. Based on uniform transmission line positive and negative traveling wave equation， the along line voltage calculating formula is derived with the measuring current and voltage. The characteristics of calculating along line voltage is analyzed separately for fault point before and after the compensated capacitors. The calculating along line voltage will appear minimum amplitude points if the fault point is before compensation capacitor， and the minimum voltage amplitude is zero in theory. If the fault point is after compensation capacitor， the calculating voltage even having minimum，but its amplitude is a bit higher. According to the characteristics， a method for identifying the point of fault is derived， integrating it with the traditional distance protection， a new series compensated line distance protection program is proposed. The program can solve distance protection overreach problem and improve the sensitivity of distance protection for series compensated line.When series compensation capacitors installed on the end of line the sensitivity will not be impacted by series compensation capacitors. EMTP simulation results show the effectiveness and reliability of the program.