1Optimized Design on Stripping Distribution Engineering in Steering Period of Mining Block in Heidaigou Surface MineMA Jin-yan, CAI Qing-xiang, LIU Fu-ming, CHEN Shu-zhao, XIAO Guo-qiangDesign and Technology1-32Improved Two Stage Method and Application to Site Selection of Coal Underground Gasification to Natural Gas ProjectDuan Tian-hong, ZHOU Li-min, WANG Zuo-tang, HE Sheng, WANG Chun-jun, WU Fu-qingDesign and Technology4-73Study on Mining Feasibility of Steep Inclined Seam Group in Tuanba and Baozi Minefields of Huayingshan CoalfieldLIU Xiao-hua, YANG BoDesign and Technology8-104Design on Mixed Mining Plan of Coal Resources under Building, Railway and Water Body After Integration of Zhaozhuang MineZHANG Lei, CHANG QingDesign and Technology11-12,165Optimized Analysis on Vertical Layout Coal Pillar Size in Lower Level SeamLIU Xin-jie, WANG Qing, DAI JinDesign and Technology13-166Review on Contents and Significances on Drawings of Mine Flameproof Electric EquipmentLI Hong-meiDesign and Technology17-197Study on Compression of Voice Signal in Mine Wireless Through-the-earth CommunicationZHAO Hong-yu, TAO Jin-yi, WANG Yuan-yuan, CHEN Yue-ruDesign and Technology20-22,258Workshop Three Dimension Design of Coal Preparation Plant Based on SolidWorksHUANG Bo, WEI Bin, LI Zhi-yong, GE Xian-haoDesign and Technology23-259Study and Application of Drilling and Blasting Heading Technology to Deep Mine Rock RoadwayCHEN Qun-zhongConstruction Technology26-2810Freezing Shaft Design Plan and Construction Technology of Mine Auxiliary ShaftXUE Yi-hongConstruction Technology29-3111Support Technology of Large Span Open-Off Cut for Fully Mechanized Slice Coal Mining Face in Thick Seam with Soft Roof, Soft Coal and Soft FloorWANG Meng, YANG Ke, ZHAO Pei-yu, YAN Shu-yuan, MA Hong-yeConstruction Technology32-34,3812Lining Method of Excavation Profile Line for Construction of Mine Simplified Three Centered Arch RoadwayZHANG GangConstruction Technology35-3813Study and Application of Fully Mechanized Excavation Quick Construction Technology in Large Cross Section Rock RoadwaySUN Mi-yinConstruction Technology39-4114Study on Construction and Control Technology of Mine Soft Rock Roadway Passing Through Broken Zone of FaultJIANG Kang-qian, WANG Liang-haiConstruction Technology42-4415Study on Safety Mining Technology of China First 450 m Ultra Long Fully Mechanized Coal Mining FaceSONG Li-bing, WANG Qing-xiongProduction Technology45-47,5116Study on Protection Effect of Protective Seam Mining Under Condition of High Gas DrainageLI Yao, LI Jun-jian, SHI Bi-ming, LI HaoProduction Technology48-5117Effect Analysis and Technology Optimization of Gas Drainage with Roof High Level Strike BoreholeYANG Ya-liProduction Technology52-54,5718Design and Application of Negative Pressure Dust Collector to Dry Borehole Drilling Site in Seam GatewayYU Guo-lin, FAN Heng, HUANG Xiao-yuan, LI Zhi-liProduction Technology55-5719Study on Disaster Control Method of Room Mining Goaf with Shallow Mining DepthZHANG Yong-aiProduction Technology58-6020Analysis and Project Verification on Pressure Released Gas Drainage Mechanism of Closed Distance Seam GroupLIU Jian-gaoDiscussion on Research61-64 