Simulation lessons was improved critical thinking, improved communication skills, and acquired knowledge related to clinical performance. This research was conducted to understand and describe the world of adult nursing student’s real simulation class experience by Qualitative method. This study was carried out by using deep interviews and participant observations from August 2016 to February 2017 to 24 participants who are studying at P city department of adult nursing students. Analysis of data was performed using method presented by Colaizzi. The results From significant statements, 8 theme clusters were identified as follows: Burden on new school subjects and the need to operate expensive equipment, Instinctively immersed in an emergency, Expanding knowledge and stimulating learning through group and self-evaluation, Nursing practice through repeated practice, Education where fear of clinical practice disappears, Compensate for the muscles of the heart due to a momentary wound, A sense of security in a virtual situation, Formation of gap between group activities. Therefore, it is suggested that the class should be operated and evaluated in order to operate the simulation class effectively.