1Key theoretical issue need to be solved and research status of coal and gas co-miningWANG Jia-chenExperts Forum1-32Design on centralized layout of chamber group in 1000m depth mining blockWANG Zhao-shen, LI Gao-chuan, ZHANG Fu-jingDesign and Technology4-63Study on load calculation method of new mode chain belt feederWANG Zhen-xing, ZHAO Ji-yun, ZHANG De-sheng, QI Hou-baoDesign and Technology6-84Research on condition monitoring and control as well as fault diagnosis system of mine flame proof hydraulic winchJI Han-wenDesign and Technology9-115Voltage dropping of electric equipment starting terminal in 380 V system affected to electric cable selectionYANG Yin-lingDesign and Technology12-146Comments on several issues in electric design of coal preparation plantXU Xiao-zuoDesign and Technology15-167Comments on application of coal bed methane(gas)to coal fired boilerDesign and Technology17-198Application of Chinese pressurized filtration technology to Vietnam coal preparation industryGUO Zhi-qiangDesign and Technology19-219Optimization on blasting excavation parameters of mine small cross section hard rock roadway base on experimentFENG Yi-zan, LI Yuan-hongConstruction Technology22-2410Narrow coal pillar left and bolt support technology for open-off cut along goaf and under complex roofConstruction Technology25-2811Rapid construction technology of coal chute and coal feeder chamber in mine inclined shaft bottomZHANG Zhi-rong, YUE Tai-gang, MA Li-qiangConstruction Technology28-3012Development and application of full hydraulic bolt drilling rig in Tashan MineMA You-caiConstruction Technology31-3213Rapid Seam Opening Technology with Small Angle for Deep Gently Inclined Outburst SeamLI Mei, CHENG Guo-jun, WANG KangConstruction Technology33-3514Applied study on fire prevention and control technology during mining stop，powered supports removed and sealing period of fully mechanized top coal caving mining face in Tashan MineLIANG KunProduction Technology36-3815Application of consolidation technology to prevent coal and gas outburst for cross-cut seam openingZHU Jun-kuProduction Technology39-4116Study on mine pressure behavior law of fully mechanized high cutting coal mining faceWANG Zhang-yin, HOU Shu-hong, ZHANG WeiProduction Technology41-4317Practices on mechanized longwall mining technique with Suspended Moving Powered SupportLI Huan-binProduction Technology44-4518Water inrush coefficient and mine water disaster prevention and controlGUAN En-taiProduction Technology46-4819Fault wire line selection method of small current grounding system base on wavelet conversionYU Yong-jin, ZANG Bao-huaProduction Technology48-5020Study on critical value of predicted sensitive index for gas outburst danger from "three soft" seamYAO Xiang-rong, ZHU Yun-hui, SHI Bi-ming, BAI Yun-feiDiscussion on Research51-53 