A method for providing thermotolerance of a plant and the applicability of transgenic plant are disclosed. DNA fragment containing a gene encoded EXPORTIN1A is transferred into a plant cell to provide or enhance thermotolerance of the plant. The method can be applied in transgenic plant cell cloning.一種使植物表現後天性高溫逆境耐受性狀的方法及其應用,包含將一段可轉譯出XPO1A蛋白的去氧核糖核酸片段轉殖入一不具耐受高溫逆境性狀或高溫耐受性不佳的植物細胞中,使含此去氧核糖核酸片段的轉殖株表現出可耐受高溫逆境的單一性狀。此單一性狀表現可應用於轉基因植物之選殖。