The naughty fort can be said to be a new, very integrated children's park designed for the nature of children who like to drill, climb, slide, roll, shake, swing, jump, shake, etc. Naughty forts foster independent personality, physical exercise, and intellectual wisdom. It is not subject to site restrictions, either inside or outside the house or in an irregular location, which is arbitrary, non-dynamic, interactive and functional, and can be installed, simple to manage, non-dynamic equipment and maintenance facilities. Fortress materials consist mostly of engineering plastics, pvc skins, zinc plating steel piping, steel pipes, heavy cannon sponges, etc. The price of the fort in different programmes varies from $300 to $1,000 per square metre depending on material performance. Powerless means that the naughty fort can operate without any power installations, saves invisibility the cost of operating, while at the same time providing for the safety of travellers is a welcome factor for buyers. (b) the naughty fortress has been designed by our division as a new integrated children's recreation centre formed by science's stereotypic combinations, as well as an excellent training centre to enhance children's mental, physical and social abilities, while incorporating the characteristics of early childhood education, all of which are colourful, light, soft, non-vulnerable, flexible, qualified and safe. The facility enables children to develop their full energy and imagination and, while having fun, to have an aerobic stasis in their bodies; it helps to meet the psychological demands of young friends to be strong, to be backward, to be courageous and to explore, to grow up healthier and wise; and it helps to develop the child's bravery, tenacity, tenacity and tenacity, to exercise speed, strength, balance, coordination and so forth, for the purpose of strong body and mind. The great benefit of children's play facilities is happiness! When children interact with play facilities, and it is when children play with them, play facilities become part of their play and even a source of joy. Play is both the essence of the game and the purpose of the playground. In order to better understand the nature of children's play facilities, we can begin with a simple analysis of the relationship between children and play and play. Play facilities are material, a material vehicle for games and games. Play is an act, a direct expression of the child's behaviour in a play facility; play is the essence of the child's behaviour in a play facility. Play is the essence of the child's development, where children grow up in play and experience different kinds of exercise and growth in different kinds of games, such as intellectual growth and intellectual games, which are carried out by skeletal muscles and other physical functions of sports; that emotional and cognitive development involves the gradual accumulation and improvement of experiences of the emotional elements and levels of awareness inherent in the game, such as raising small animals that foster a child's sense of love and responsibility, from which children also gain pleasure and knowledge. More importantly, in recreational activities involving other members of society and children, children can learn from social role-playing and self-awareness, which other games cannot do. The children's naughty fort has now become a mature recreational project, recognized by a growing number of parents and children, as well as a credible business project for operators, which has flourished in a variety of malls, supermarkets, squares, etc. The naughty fort project was widely admired。