Abstract: With the continuous development of the economy, traditional current protection is no longer able to meet the needs of the existing 35kV power grid for line protection. Therefore, this article focuses on the characteristics of traditional adaptive current protection and adopts a new protection action criterion based on two-phase current difference adaptive current quick break protection to design the protection scheme and analyze the design simulation results, The protection scheme has been verified to have the same sensitivity under different fault types and operating states of the power system, and the protection range has been greatly improved compared to traditional current quick break protection, which is significantly helpful for improving the relay protection capability of the current power grid.