The technology of concrete dismantling with ultrahigh pressure water has a prominent advantage relative to traditional mechanical operation. The Bernoulli equation was used to analyze the process of ultrahigh pressure water breaking concrete. The relationship between pump pressure parameters and ultrahigh pressure water of concrete surface was established. On the basis of the experiment， the relationship between the parameters of the ultrahigh pressure water concrete dismantling and the effect of dismantling was investigated. The results have a certain reference significance for the analysis and application of ultrahigh pressure water concrete dismantling.