Joining is reliable. Ding Xiao Smart English has registered its trademark and obtained the certification from the industrial and commercial department. With a legal business license, the company is currently in the state of opening. Ding Xiao Smart English has been polished by experts from the Institute of Psychology of Beijing Academy of Sciences, Beijing Foreign Studies Institute and Beijing Normal University Research Institute for 10 years, combined with lexicology, psychology, physiology and other disciplines, and has been experimented with nearly 30,000 students in Beijing Normal University, and finally developed a set of efficient and fast word memory methods.