Differential protection is an effective means of solving the problem of distribution network protection with DG access. However, the existing communication construction level of a distribution network greatly restricts the construction of differential protection. In this paper, the idea of current phase and phasor differential protection is integrated, and the current phase information is transformed to reduce the capacity of communication information. It applies the recursive least squares method to achieve fast estimation of short-circuit current phase parameters, and proposes a short-circuit current phase correction strategy to address the interference of CT saturation and DC component with protection. Finally, the construction principle and protection criterion of new current differential protection suitable for a distribution network with multiple DGs are proposed. Based on the PSACD/EMTDC platform, a simulation model is built to verify the prediction accuracy of the proposed current phase parameters and the performance of the new differential protection. The results show that the proposed current phase parameter prediction method is fast, has high precision and good anti-CT saturation ability. The proposed new differential protection principle shows good performance.