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Cognitive Diagnostic Assessment (CDA) integrates the measurement objectives into the cognitive process model through the cognitive analysis, and then understand the mastery mode of students in fine-grained knowledge points. In this paper, 12 PISA test items are analyzed, and their attributes are calibrated, forming a cognitive model based on the six MKCs in PISA. Through the comparison of DINA, DINO, RRUM, ACDM, GDM, LCDM, LLM, G-DINA and Mixed Model, LCDM with a better model fit is selected to analyze the data of 19, 454 students in eight countries, and the similarities and differences of the six MKCs in eight countries are obtained. The knowledge states are analyzed and the learning path of students' MKCs in different countries are explored.