天门山地质上为完整的向斜构造单元，发育着典型的中山岩溶台地峰林峡谷地貌。天门山的山顶为岩溶台地绝壁景观，溶丘、石芽广布，构成一片片空中石林奇观，又因遍地青苔覆盖，野藤缠绕，奇石秀木结伴而生，处处皆是天成的盆景，犹如神仙造就的盆景大观园，可以令游客心情领略自然奇趣，感受造化神奇。

　　Tianmen Mountain is an integrated synclinal geological unit which has the landform of middle-mountain karst platform with peak groups and canyons.The top of Tianmen mountain is a cliff sight of karst platform.The karst hillocks and karrens spread wildly to form wonders of stone forests in the air.Moreover,with moss spreading all over the ground,wild vines twining and twisting,what come into sight are natual bonsais like grand gardens which were as if created by the immortals.The tourists can relish the natural wonders and feel the miracles of the Creator to their hearts’content.