The objective of this action research was to study the Authentic Assessment Model for nursing students in clinical practice, and satisfaction used the Authentic Assessment Model. The sample groups were 16 the third year nursing students as practiced at the Pediatric Cardiology Ward, Queen Sirikit Heart center of the Northeast, academic Year 2019. The instrument research were guidelines for Authentic Assessment for nursing students in the clinic, Learning Log, Observation form and a semi-structured questionnaire for the satisfaction of participation in authentic assessment in clinical practice. The research results were found that: The Authentic assessment model for clinical nursing students practice consisted of student assessment prior to clinical practice, Assessing daily and weekly progression during clinical practice, evaluation after clinical practice, and the follow up evaluation for the application of knowledge to be used in nursing practice. The authentic assessment components consisted of supervisor instructor, Preceptors, Self-evaluation and Peers. The nursing students were satisfied with the authentic assessment by reflecting that the evaluation was fair, coverage nursing skills, and feedback whatever to improve and develop themselves before the end of clinical practice, high confidence in the measurement system, and evaluate to judge the practice score's on the Clinic part.