为了解重庆合川钓鱼城古战场遗址砂岩风化现状，保护文化遗址、风景名胜及周边居民和游客的安全，根据钓鱼城所处的地质环境划分了文物本体区的地层，进行区域地表与地下水的水质分析，同时对第⑥层上、下不同深度的地层取岩芯进行半定量的XRD矿物测试及X荧光化学成分测试。由于文物本体主要赋存于第⑥层砂岩，因此对该层不同位置砂岩的风化部位取样，并进行相关测试及综合比较。结果表明风化样中石英及方解石含量较岩芯样增多，长石含量不同程度降低及石膏等可溶盐对岩石的片状风化有一定的作用。

Fishing Town in Hechuan District of Chongqing,as an ancient battlefield, has important cultural, historical and military values.In order to avoid geological disasters, protect cultural relics and scenic spots ,and make sure the safety of surrounding residents and tourists, we should research the features of sandstone weathering of this site. According to the geological environment of Fishing Town, we divided rock mass of the cultural relics into 6 layers, and analyzed the water quality of surface water and groundwater of the area. Meanwhile ,we obtained rock coring samples at different depths of stratum No.6 and conducted half quantitative X-ray diffraction(XRD) test and X fluorescence chemical composition test. Since the cultural relics were mainly found in sandstone stratum No.6, we carried out identical tests of weathered samples at different positions of this layer, in association with analysis data and comprehensive comparison. Test results show that the contents of quartz and calcite in weathered samples are larger than those in rock core samples; moreover, reducing of feldspar content at different degrees and soluble salts such as gypsum play a significant role in rock flake weathering.