HZS/HLS series of concrete mixing plant/towers are HONGDA's newly developed products on its many years' experience of producing concrete mixing equipments combined with international top technology and advantages and techniques of advanced machine types both in CHINA and abroad in recent years. The series of product passed the test of NATIONAL CONSTRUCTION AND CITY BUILDING MACHINERY QUALITY SUPERVISION AND TEST CENTER and are approved to reach national standards. The series of product also passed national science and technology commission technical achievements appraisal organized by SHANDONG PROVINCE DEPARTMENT OF SCIENCE AND TECHNOLOGY with their conclusion: they are the only products in the same trade in CHINA that achieves domestic leading level in general index and achieves international advanced level in such aspects as productivity,noise control,environmental production,etc. In them HZS180 concrete mixing plant was chosen as one of NATIONAL KEY NEW PRODUCTS in 2005.