Solution heat treatment is employed in an attempt to improve oxidation and mechanical properties of an as-cast $Ni_{3}Al$ alloy (IC221M) at operation temperature, $900^{circ}C$. Solution heat treatment was hypothesized to have beneficial effects through dissolving ${gamma}+Ni_{5}Zr$ eutectic into the matrix. The microstructures, oxidation behavior in air at $900^{circ}C$, and mechanical properties with aging times at $900^{circ}C$ were examined after solution heat treatment of as-cast $Ni_{3}Al$ alloy in Ar for up to 100 h at $1100^{circ}C$. The oxide penetration depth into the matrix was dramatically decreased and more homogeneous surface oxides were obtained relative to the no solution treatment case. Hardness was improved by solution heat treatment due to a solid solution strengthening effect by Zr, but the tensile properties after solution heat treatment were not significantly different from those prior to treatment.