An isoxazole derivative is provided. The isoxazole derivative has following formula: wherein R1, R2, R3, R4 and R5, independently, include hydrogen, hydroxy or C1-C12 alkoxy optionally substituted with oxirane, thiirane, aziridine, amino, cycloamino, aminohydroxy or cycloaminohydroxy. The invention also provides a pharmaceutical composition for treatment of osteoporosis and cancer including an isoxazole derivative or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier.