According to Baidu Encyclopedia platform, "Dr. Long" early education toy book is positioned as a domestic high-end toy book brand. The research and development of "Dr. Long" products was jointly planned by many preschool education experts in Lan Tu, children's psychologists and China mathematical physics experts. It is the most suitable self-study teaching material for infants aged 0-6 years, covering infant's intelligence inspiration, mathematical deduction, language expression, natural science, humanities, life skills, artistic observation, aesthetic feeling and so on.

Each product of Dr. Long is classified according to the developmental characteristics of infants of all ages, including voice books, pop-up books, bath books, turn-over books, flip books, spelling books, touch books, sticker books, game books, doll books and so on. All products are printed with pure natural, healthy and environmentally friendly soybean plant ink, and the glue is safe and nontoxic gel glue. The paper is made of high-grade recyclable paper, and the auxiliary materials have undergone strict environmental protection tests. All the products have passed the European En7 1Part 1-3 and CE tests, and meet the toy standards of American ASTNF963 and Korean KC.