This study mainly used observation method, interview method, questionnaire method and physical analysis method. The subjects of this study are the teachers of kindergarten X in Chengdu City, and we analyzed the use of 30 cloth bags by distributing the Questionnaire on the Current Situation of the Application of Cloth Bag Evaluation for Young Children and interviewing 13 respondents at the same time to understand the application and problems of cloth bag evaluation in this kindergarten. At present, Kindergarten has some issues, such as the lack of diversity in the subjects used to assess children’s portfolios, the lack of standardization of evaluation standards, and the unclear objectives. According to the survey results, the situation of children’s archive assessment in X kindergarten was analyzed, and the corresponding improvement measures were carried out. In terms of portfolio assessment, it is necessary for education authorities to set standards; strengthen the construction of teachers; strengthen monitoring of the whole process and establish a long-term governance mechanism. Second, kindergartens need to strengthen teacher training and leadership in assessing children’s portfolios, as well as professional capacity development in terms of systems, content and assessment standards. At the same time, they must strengthen communication between families, make full use of and improve the parental assessment function, so as to make portfolio evaluation more abundant, comprehensive and impartial. Teachers need to continuously improve their conceptions of education based on a thorough understanding of the “handbook”, improve their evaluation and teaching reflection ability, and then improve the quality of children’s portfolio evaluation.