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The strengthening of arch dam foundation is an important engineering measure to ensure the stability of dam abutment and the safety of arch dams. This paper took the reinforcement measures for the foundation of Dongzhuang arch dam as the research object, systematically simulated the discontinuity layer, mud fissures, wide joints and corresponding reinforcement measures of the dam abutment rock mass. The finite element analysis was conducted on the reinforcement effect of the dam foundation using elastic-plastic constitutive law. The calculation results indicate that the foundation reinforcement measures have little effect on the maximum displacement and stress of the dam body, but to some extent, they reduce the yield zone of the dam body and the foundation surface, improving the stress on the dam body. Through overload calculation and analysis, it is found that the foundation reinforcement measures have little effect on the plastic zone of the arch dam body, but the yield zone of the foundation surface is significantly reduced after the foundation reinforcement. The foundation reinforcement measures have a relatively smaller impact on the yield zone volume of fault f5 and muddy fissure Rnj3, but a significant impact on the yield zone volume of large fissure L22. In summary, the foundation reinforcement measures taken for Dongzhuang arch dam have improved the stress on the dam body and foundation, and improved the stability of the dam foundation. [ABSTRACT FROM AUTHOR]