湖南崀山拥有独特的丹霞喀斯特现象，但具有溶蚀力的水对丹霞地貌区重要的物质基础砂岩和砾岩的侵蚀还没有进行过深入的实验研究。以此为切入点，通过实地采样获得41块砂岩、砾岩岩芯，选择其中18块岩芯平均分成3组，分别放入2%、5%、10% 3种不同浓度的H₂SO₄溶液中浸泡并连续12天定时观测、记录，最后把未破碎的3块砾岩岩芯进行单轴抗压实验，其抗压强度在9.6～13.7 MPa之间，仅为这些岩体干抗压强度的1/10左右。通过4处采样地的实验数据对比还发现，崀山砾岩抗酸侵蚀后的抗压强度是最低的，如果遭到同样外力的破坏，崀山丹霞岩体更容易破损倒塌。以上岩芯抗酸侵蚀的脆弱性和岩芯的物质组成、结构等有关。在宏观实验观测的基础上，初步微观半定量分析解释了丹霞地貌区砂岩和砾岩抗酸侵蚀脆弱性的一般特点，为今后更加合理地保护崀山丹霞地貌提供依据。

The unique phenomenon of Karst in Danxia Landforms may be observed in Langshan, Hunan Province, but there are rare deep exploration about acid erosion to sandstones and conglomerates which are important material foundation in Danxia Landform areas. Base on this point, 41 cores of sandstones and conglomerates were collected from Langshan, 18 cores were selected from them and put into sulfuric acid solutions with three different contents of 2%, 5%, 10%, observed, and recorded continuously for 12 days. Three cores which were not collapsed were undone uniaxial against pressure test at last. The strengths of against pressure of conglomerates declined dramatically after acid erosion, the values to against pressure remained 1/10 only to these rocks in the dry condition. Also the strengths of the 3 cores to uniaxial against pressure after acid erosion were the  lowest in the four sampling sites by analyzing experimental data, so the Danxia rocks in Langshan are easy to collapse and destroy under the same external forces. The reasons of vulnerability to against acid erosion of rocks in Danxia landform are relevant closely to components and structures of those cores by identifications under a polarizing microscope to flakes. Based on macroscopic experimental observations,  general characteristics of against acid erosion vulnerability of sandstones and conglomerates in Danxia Landform areas were micro semi-quantitative analyzed and explained. It is valuable to provide basis for protecting the world natural heritage site and get a sustainable utilization for mankind in the future.