For a long time, there is no enough attention on the 10 kV (or 35 kV) and below mid-low voltage busbar protection. If bus fault occurs, the selectivity and rapidity of busbar protection is poor. To improve mid-low voltage busbar protection, this paper proposes a scheme of mid-low voltage busbar protection for intelligent substation based on power direction combining with the characteristics of mid-low voltage system, which includes its constitution mode, function logic, and network structure. Moreover, it uses simulation system to verify and analyze power directional element. The scheme is of simple principle, excellent selectivity and rapidity, so it can be popularized and applied in intelligent substation without increasing investment cost. This work is supported by Science and Technology Project of State Grid Corporation of China [2017] “Key Techniques Research of Secondary Device Universal Platform used in Intelligent Transformer”.