Abstract: The unilateral conductivity of internal power electronic devices and the charge/discharge characteristics of energy storage components made the transient current complicated while considering the DC side pole-to-pole fault of two-level VSC converter. As a result, it brings challenges for fault current analyzing. To solve this problem, the transient feeding process of VSC converter in initial stage of the bipolar fault was studied in this paper. Based on analyzing the limits of feeding current rate, two time boundaries were defined for identifying the commutating conditions. The different DC fault areas can be approximately located by the commutating condition at initial stage of the DC fault. In this case, this paper provided a more detailed converter DC side fault analyzing method and that will be the foundation for future protection and fault location design. PSCAD simulation results verify the correctness of the analysis done in this paper, and also show that the switching information of the converter in the initial stage of DC fault can be used to partition the bipolar DC short circuit.