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Combining with structure forms and landscape requirement, the development and evolvement of arch bridge from prior stone arch bridge to whole welding steel arch bridge of the time is summarized. Against the Fenghua bridge in Tianjin, a new style arch bridge over the Haihe River adopting high performance materials, advanced construction methods and landscape circumstance programming is introduced, and the study on design and system conversion of the novel half-through steel arch bridge is performed.During the course of the study, we keep up seeking optimization of line shape of sutructure, layout of members and design of main members together with connection nodes combining actual status of the project through repeated calculation and analysys to the whole sutructure and local position to improve structural sight effect and inner force distribution, to strengthen maneuverability of construction at the same time. The paper introduces the whole design process from precept, layout, members and nodes concept to substrural design of Fenghua bridge, introduces static and dynamic calculation through which the original precept was deepen and optimized continuously. For every member and node including the arch, steel girder, bequille, column, petal framework and wind brace, we abtain their better section shape and dimension so that they can meet the need of rigidity and strength and guarantee security and stability of the whole structure. Structural system conversion, construction control and cable force adjustment method are advanced, they were approved to be feasible and effective.Correlative outcome of structural test indicated that the factual line shape and innerforce distribution of the structure were accord with prospective result of design work, the design of main members and key nodes was reasonable, the optimization work including line shape of the arch based on improving landscape effect, setting of bequille, column, connection between arches, petal framework and cables layout based on improving the property of the structure was feasible, reasonable and effective. The test made chear that structural system conversion, construction control and cable force adjustment technics of new-type arch bridge were feasible and effective too.Practice proves that it is enforceable for the adoption of the new-type arch bridge in design, construction, supervision and consruciton control etc. The research of the bridge would supply some information to refer. Considering continuable development of our society, new-type steel arch bridge could be applied more abroad.
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