Automatic prosodic boundary detection and annotation are important for both speech understanding and natural speech synthesis. Manual annotation of prosody boundary label is very laborious and time consuming. In this paper, from the perspective of interaction of adjacent tones, we proposed a method to automatically detect prosody boundary based on tone nucleus features and Deep Neural Network (DNN) model. This method firstly calculated the boundary-related parameters by applying the tone nucleus features. Then, the parameters were modeled by DNN. For comparison, the baseline system applied the acoustic features of syllable. The experimental results showed that the proposed method using tone nucleus features outperformed the baseline system, with a relative 4% improvement. It demonstrated the efficiency of the proposed method.