瓦斯对矿井安全的威胁主要有突出、爆炸、和窒息三种形式，最严重的瓦斯灾害是瓦斯爆炸和瓦斯突出事故，它严重威胁着井下人员的生命和矿井设施的安全。瓦斯涌出量是影响煤矿安全生产的重要因素。在矿井生产中，回采工作面瓦斯涌出量占全矿井涌出量的50~80%，是全矿井主要的瓦斯涌出源，由于瓦斯含量、顶板管理、生产工艺、通风等不同因素，回采工作面瓦斯涌出量变化很大，因此，加强回采工作面瓦斯涌出量预测方法及瓦斯涌出的影响因素研究，掌握回采工作面瓦斯涌出规律，对改善我国煤矿安全生产状况具有积极的意义。 本文系统地论述了煤层瓦斯的赋存状态与煤对瓦斯的吸附作用以及回采工作面瓦斯涌出的基本规律。通过对诸多瓦斯涌出影响因素进行灰关联分析，确定了大水头煤矿东113回采工作面的主要瓦斯涌出影响因素为大气压。本文收集、整理和分析了大量实测数据资料，通过实测和数学方法，总结了大气压影响回采工作面瓦斯涌出的规律。通过对现有回采工作面瓦斯预测方法存在问题的分析和总结，将大水头煤矿东113回采工作面瓦斯涌出现象实时观测研究成果数据作为学习样本和预测实例，建立了回采工作面瓦斯涌出量的BP神经网络模型，对预测模型进行训练和验证，取得了较好的实际应用效果。本文根据大水头煤矿的生产实际，模拟了采空区漏风分布，对采空区进行网格化处理，建立数学模型，利用网络解算计算出了采空区各分支的风量与风压，分析了大气压力变化对于东113综放工作面采空区漏风影响的规律。

The hazards of the gas to mine safety normally display of three forms: burst、explosion and asphyxia. Among them gas explosion and gas burst are the most seriously, which do great harmful to mining workers and mine facility. Gas emission quantity is an important factor affected mine safety. In the coal mining, the gas emission from stope face account for 50%~80% of the whole gas emission. It is the chief headstream of the gas emission in coal mine. The gas emission of the working face changes a lot. Because of the variation of the coal mine pressure, the gas-bearing capacity, the difference of the roof control and production technology. So it is significant to work safety of coal mine in China by means improving the predicted method of stope face gas emission, researching influencing factor of the gas emission and discovery gas emission regular of the stope face. The paper systematically discusses the gas reservoir state，the coal absorption to the gas and the theory of the gas emission in working face. There are many factors that affect the gas emission of working face. The main influencing factor was analyzed by using grey correlation theory, which was atmosphere pressure in Dashuitou coal. The theory of gas emission in working face was summarized by analyzing the data that measured in the coal include the atmosphere pressure and temperature and so on. Take the data measured and calculated as train samples to set a BP model tested and proved, which worked well in the practical application. And the paper imitated air leakage distribution of the goaf, set a model and calculated the air quantity and air pressure and finally analyzed the relation between atmosphere pressure and gas emission in goaf.