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Purpose: This study aimed to verify the effectiveness of dispatcher-assisted cardiopulmonary resuscitation (CPR) by analyzing the effect of bystander cardiopulmonary resuscitation on the return of spontaneous circulation (ROSC) and neurological outcomes in patients of cardiac arrest. Methods: A total of 2,329 the emergency medical services reports were collected for non-traumatic patients of cardiac arrest aged 15 and older, attended by 119 paramedics from Fire Department C from January 1, 2019 to December 31, 2021. Additionally, we collected data on the performance of CPR by bystanders and heart avers. Data were analyzed using SPSS version 29.0. Results: Dispatcher-assisted (DA) CPR was performed in 70.3% of subjects. Compared with no CPR, DA-CPR was 1.567 times (p=.026) higher likelihood of return of spontaneous circulation and 1.889 times (p=.076) higher likelihood of improved neurological outcomes. Compared with no CPR, spontaneous CPR (SP-CPR) resulted in a 2.642 times (p=.000) higher likelihood of return of spontaneous circulation, and a 3.363 times higher likelihood of improved neurological outcomes (p=.002). Conclusion: The operation of DA-CPR and CPR training opportunities for bystanders should be expanded.