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The knowledge and ability of preschool teachers' teaching guarantee refers to the knowledge and ability that preschool teachers need to have in teaching guarantee. Including children's developmental psychology, early childhood education, conservation and health, kindergarten education management and other disciplines, as well as the cultivation of early childhood education methods, teaching design, classroom management and other teaching-protecting abilities. Kindergarten teachers need to understand the development characteristics and needs of children, be able to make appropriate educational plans and activities, provide a warm and safe learning environment, and pay attention to children's physical and mental health and all-round development. At the same time, kindergarten teachers should also have good communication skills, observation skills and teamwork skills, and establish good cooperative relations with parents and colleagues to jointly promote the growth and development of young children.