A solid dispersion of N4-(4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)-3-methylphenyl)-N6-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)quinazoline-4,6-diamine and processes for preparing the solid dispersion are provided herein. Also, a pharmaceutical composition comprising a solid dispersion of N4-(4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)-3-methylphenyl)-N6-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)quinazoline-4,6-diamine and uses thereof are provided herein.本文提供一種N4-(4-([1,2,4]三唑并[1,5-a]吡啶-7-基氧基)-3-甲基苯基)-N6-(4,4-二甲基-4,5-二氫噁唑-2-基)喹唑啉-4,6-二胺之固體分散體及用於製備該固體分散體之方法。此外,本文提供一種包含N4-(4-([1,2,4]三唑并[1,5-a]吡啶-7-基氧基)-3-甲基苯基)-N6-(4,4-二甲基-4,5-二氫噁唑-2-基)喹唑啉-4,6-二胺之固體分散體之醫藥組合物及其用途。