The current flow controller (CFC) can achieve the optimal distribution of the DC power flow and increase the power flow freedom of the DC power grid, but it also makes the original power flow algorithm not fully applicable to DC power grid. In this paper, a power flow algorithm for DC Power Grid with CFC for specific power flow control target is proposed, which based on equivalent power injection model and simultaneous solution method. The role of CFC in regulating the power flow of the controlled branch is transferred to the node where the controller is installed; the additional constrained equations introduced by CFC are solved in conjunction with the constrained equations of DC power flow calculation, which retains the quadratic convergence of Newton-Raphson method, improves the operation efficiency and ensures the operation accuracy. The power flow calculation of multi-terminal DC loop network based on PSCAD/EMTDC simulation platform is compared with the proposed power flow calculation based on equivalent power injection model. The correctness and accuracy of the method are verified.