Because mobile phones and tablets are open platforms, it is easy to get in touch with bad information. Xiaoha robot is a closed system, and its contents are screened by parents and companies. Mobile phone tablet is a person's terminal. Xiaoha robot can interact with parents, but parents of mobile phone tablet can't guide and supervise. Xiaoha robot can prevent addiction remotely. Realize multi-angle interaction, bilingual explanation, 3D image display, and play games to learn English, not limited to the paper version of kate004.