###### Abstract
In 2000, we also measured the fracture height of the coal seam after mining according to the consumption of flushing fluid in the borehole. [PERSON] [16; 17; 18] analyzed the characteristics of the water-holding rock group in the aquifer, and he also classified water-preserving coal mining into three types, namely, natural water-preserving mining, controlled water-preserving mining, and special water-preserving mining. [PERSON] et al. [19] considered the resource properties of water and gave a set of evaluation systems to define and calculate the water resource carrying capacity. [PERSON] et al. [20] used physical simulation tests to study the damage law of shallow coal seam overburden and pointed out that the mining height is the main factor affecting the development height of the water-conducting fracture zone. [PERSON] et al. [21] used a physically similar simulation test to investigate the law of water-conducting fissure zone development in the comprehensive release working face of three soft coal seams. They discovered that the law of mining intensity on the reservoir area and periodic incoming pressure will cause an increase in water gushing at the working face. [PERSON]'s [22] study assessed available data of inflows into underground coal mines and utilized computer simulation of water flows through fracture networks. The study concluded that flows into mines is typically via an interconnected network of preexisting and mining-induced fractures. The height above the coal seam that mining-induced fractures extend is typically related to the width of the panel. A study by [PERSON] [23] has shown the characteristics of acidic and nonacidic mine water that permeate from open pit coal mines; there is an accumulation of petroleum, oil and grease, and heavy metals in the coal mine wastewater and it is recommended to manage these waste liquids to control the level of pollution at the source. The above research concepts of green mining and water conservation mining have an important role in the research of predicting the height of water-conducting rift zones on the roofs of coal seams, but due to the complex geological environment of mines in northwest China, the surface is covered by a thick loess layer, and the mining disturbance on the surface is intense under the geological conditions of the extra thick coal seam. This results in the significant and complicated development of water-conducting rift zones, and no reliable prediction of the height of water-conducting rift zone development in comprehensive mining has been formed so far. The research on the development height of water-conducting fracture zones under different geological conditions has always been a key research topic for mine geologists in China. Based on the above and a large number of research results, the industry has revised and compiled new specifications and guide lines [24], which provide a scientific guarantee for guiding the safe mining of coal in the coal mines \"under three\". From the perspective of coal production, mining under water bodies is more concerned with the safety of the coal mine itself, but often neglects the safety and normal use of the water body and hydraulic structures [25], such as mining under reservoirs, as the reservoir itself plays the role of flood control, water storage, irrigation, power generation, breeding, etc. ; thus, the safety of reservoir water bodies and dams must also be given attention. In this paper, the feasibility and safety of coal seam mining under the reservoir of the Wangwa coal mine in the western ecologically fragile area of China are analyzed and discussed in the context of high-intensity mining under the dam of the mine's pea ditch reservoir to provide a reference for safe mining under similar conditions.