In the protection of UHV transmission lines, the longitudinal protection based on negative sequence, shows where it is superior. But, the biggest disadvantage of negative sequence directional element cannot reflect all kinds of fault-types. For this point , people all try to find the good improvement all over the world. So that, this paper proposes a new kind of improved negative sequence directional element. Its basic principle is that it create a negative sequence component by delay the data to come true, and the element could take action under all kinds of fault-types.