Provided a method for reducing an effective amount of Bevacizumab required for treating brain tumor. Also provided a kit used for the aforesaid method. The present method adopts a combination strategy to combine Bevacizumab treatment with ultrasound exposure, which comprises at least the following steps: administering Bevacizumab to a subject； administering an ultrasound-response medium to said subject； and administering said subject with an ultrasound exposure. Specific effective amount of the Bevacizumab treatment and the ultrasound exposure were identified. The efficacy of conventional Bevacizumab treatment is significantly improved.
