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The distributions of the interfacial energy within the composition triangle of the Zr - Ni - Al and Zr - Ni - Al - Cu systems are obtained with the non-structural approach by investigating the effect of enthalpy, entropy and the compositions of liquid and crystal in this paper. The calculation results show that the interfacial energy is highest near the eutectic lines in the 66.6% at.% Zr isopleth of the Zr - Ni - Al - Cu system. There are two regions with higher interfacial energy in the Zr - Ni - Al system: one is in the range x(Zr) = 0.40 - 0.68, x(Ni) = 0.21-0.36, the other is in x(Zr) = 0.08 - 0.12, x(Ni) = 0.31 - 0.40. The obtained higher interfacial energy regions are in good agreement with the composition ranges with higher glass-forming ability.