By doing a bird survey in Shangbiao Forest Farm of Wangdongyang Natural Reserve, Zhejiang Province in 2015, and combined with the photos taken by bird watchers in recent years, it could be confirmed that both Mountain Bush Warbler (Locustella seebohmi) (Fig. 1 & 2) and Brown Bush Warbler (L. luteoventris) (Fig. 3) are distributed in Zhejiang. However, the “Brown Bush Warbler (Bradypterus luteoventris)” in the bird list of Zhejiang which published in 2012 based on the photo from Wangdongyang in 2008, was actually the Mountain Bush Warbler. The similarity in morphology between the 2 species and their point distribution should be the main reasons for the difficulty to distinguish them in the field, and we made a comparison of distribution, altitude, song, plumage of these two warblers in Zhejiang (Table 1).