Abstract: The alternative point access of multi-type micro grid based on ac grid is expected to become the mainstream topology of distribution network in the future. For each DC micro grid, even if the voltage of the parallel node drops due to factors such as network side failure, as long as the amplitude is within a certain range, it is still expected to maintain the grid-connected operation to achieve short-term voltage support, which is one of the important characteristics of friendly micro grid. Compared with the unintentional islanding, the unbalanced power inside the micro grid is smaller, and the bus voltage rises more slowly. The traditional bus voltage stratification control strategy will be time-lapse since it switches control mode according to voltage threshold. This increases the risk that the DC microgrid will collapse itself and the voltage-sensitive devices within the grid will be damaged. In this paper, a multi-source coordinated control strategy based on voltage slope was proposed, The strategy included the primary voltage stabilization control strategy when the voltage sags at the grid side and the secondary voltage stabilization control strategy when the energy storage withdrawals, the corresponding secondary control was contained as well. Under the primary voltage stabilizing control strategy, each element switches its own control mode according to the voltage slope of the port. The output power of energy storage under secondary voltage regulation varied with the segmented pendent control characteristics of SOC, and the second derivative of bus voltage was used as a coordinated signal to control the autonomous operation of each source. In order to eliminate the voltage deviation after stabilization, secondary control was added on the basis of primary and secondary voltage stabilization. Finally, a simulation model is built in PSCAD/EMTDC, the experimental results show that the proposed strategy can effectively accelerate the time of bus stabilization and reduce its fluctuation range.