AbstractSchool readiness has a profound educational value for children's positive adjustment to primary school and holistic development. However, little research sufficiently addresses how young children view multifaceted components of learning, such as cognitive, affective and behavioural experiences on school readiness. A timely understanding of children's perceptions and experiences is crucial to shed light on how to promote transition and improve children's school readiness. This study investigated the perceptions and experiences of 41 children in China (5–6 years of age, 23 girls) regarding their school readiness based on Mosaic approach methods. The results indicated that young children have their own unique perceptions, emotional and behavioural experiences of school readiness. The perceptions of school readiness include four aspects of material supplies, subjects knowledge, interests and specialties and behavioural habits, which has similarities to that of adults in aspects of academic knowledge and social rules. Nevertheless, findings revealed young children view interests and strengths as important part of school readiness, reflecting their personal preferences and abilities. The emotional experiences could be considered positive or negative, with positive emotional experiences expressing children's curiosity and expectation, fulfilment and pleasure, and negative emotional experiences expressing academic burden, rules pressure and social worries, which need to be addressed. Young children's behavioural experiences with school readiness present two patterns of passive acceptance and active participation, they are eager to participate in activities and have a strong desire to explore and learn. Our findings extend beyond existing conception of school readiness, and give greater weight to children's interests and strengths, positive experiences and active participation. It is important to focus on children's intrinsic interests and strengths, accept children's ideas and choices, care for their emotional state and provide positive support.