Chengdu Yanfeng Technical Development Co., Ltd, invested by Southwest research institute of CREC, is a new- and high-tech enterprise. Yanfeng had its origin in a study group of Southwest research institute about Wet Shotcrete technology and was the outcome of transforming scientific and technical achievement into industry. Our business scope includes engineering mechanism; building materials; environmental protection equipment; developing , producing and selling electronic products;equipment lease, installation and technical service, technical consultation and technical service for tunnel and underground engineering, act as a purchasing and selling agent for building materials and electromechanical products, test of concrete. Our modes of business operation is production and service. We always insist on regarding technology as direction of guiding and regarding innovation as soul. Our corporation was appraised new- and high-tech enterprise in ChengDu in May, 1997 and was awarded honorary title for excellent new- and high-tech enterprise in ChengDu. It successfully got across rehearing for new- and high-tech enterprise in 2005. Our dominant product is TK series wet rotor piston shotcrete machine and it is very important achievement in scientific research that we entirely hold independent industrial property right. It won following honors: the 2nd 1998 Science & Technology Advance Prize of the Ministry of Railways, the 3rd 1999 State Technical Invention Prize. It is also named the State Important New Product and the new product recommended by the Tunnel & Underground engineering association. As the pathfinder of wet shotcrete technology in china, we not only generalizes wet shotcrete technics and homemade wet shotcrete machine with all our heart but also assume many provincial or ministerial scientific research projects about wet shotcrete technology. Now we have found a concrete laboratory and accomplish a series of shotcrete project simultaneously to pr