The Lingquansi Cave Temple, in the Henan Province of China, is a cultural heritage relic of national importance. Exquisitely cut in the rock mass, the images of Buddha in low relief, the inscriptions and the Buddhist scriptures are all stone carving art treasures of the Sui Dynasty. The cave temple was constructed on intact and compacted crystalline limestone between the fifth and tenth centuries A.R. Heavy geological deterioration and other factors have resulted in various degrees of damage to the temple's grottoes and stone carvings over the centuries such that protection and renovation are urgently required. Dazhu Grotto and the biggest and best stone carvings are the main concerns of the engineering geological study discussed here. Detailed investigations of the nature of deterioration have been carried out and proposals for remedial/preservation works are presented.