Abstract:The necessity of the special demonstration on the flood control effect of the structure crossing river is analyzed. The influence on the safety of river flood control during the construction period and use period is studied respectively. The finite element software is used to analyze the influence of engineering construction period on the surrounding flood control facilities. The rationalization proposal for the potential safety hazard of flood control existing in the construction period and use period of this structure crossing river is put forward. Finally, the conclusion on the river demonstration is given.