The formation of underground gas is related to the geological structure or geological activities, but underground gas eruption or overflow are mainly led by natural or artificial factors, such as drilling or mining. At early 20th Century, underground gas eruption or overflow were paid attention both in China and abroad to be applied mainly in earthquake monitoring or prediction. With the expansion of human activity space and periodic accumulation and liberation of intermittent energy in the Earth, the liberation of underground gas to other space are becoming more and more frequent, the main components are CH4, CO2, H2S and so on, which is one of the main causes of the air, groundwater and soil pollution as well as the personal injury. At the same time, a large number of documents and evidence prove that the earthquake and greenhouse effect as well as frog and haze are related to underground gas eruption or overflow. Therefore, the underground gas leakage is a new type of geological disaster, which is an important part of the livelihood geology involving a lot of scientific problems. Combined with the phenomena of underground gas eruption or overflow induced by drilling operation in south Taihang Piedmont (Hebi), the hazards and causes are analyzed in this paper and some geological science problems and specific suggestions are put forward.