Abstract: Impedance-based method is an effective one for stability assessment of cascaded converter systems. With the rapid development of DC distribution technology, the topology and control strategy of DC distribution power system (DPS) are becoming increasingly complicated. Consequently, the instability issue of DC bus voltage caused by the impedance mismatch of the converter is significantly prominent. This paper summarizes the current major impedance-based criteria for DC DPS, which can be divided into two types: the impedance ratio criteria and the parallel impedance criteria. Recently, a stability criterion based on global admittance (GM) is proposed to analyze the harmonic stability problem of the multi-paralleled grid-connected inverters system, i.e. a criterion to judge the system stability by whether GM satisfies the modified Nyquist criterion. As is well known, admittance is the reciprocal of impedance and they can be mutually transformed, so that the stability of DC DPS can also be analyzed from the perspective of admittance. Therefore, an admittance-based criterion is proposed to assess the stability of DC DPS. Besides, comparison analysis is executed to illustrate their main characteristics. Finally, the effectiveness of the proposed admittance-based criterion is verified by simulation results and the advantages and disadvantages of each criterion are obtained through case comparisons.