The parole rejection/approval of inmates is subject to the decision-making of parole board members of the respective prisons. Studies have found that parole decision-making is affected by multiple factors. However, the relative importance and mutual influences between the factors that parole board members consider during the parole decision-making process is rarely discussed. Furthermore, the studies of decision-making factors that influence choices for parole have mainly focused on the parole board of men's prisons. It is the intention of this study to show the difference between factors influencing parole decision-making on parole boards of both men's and of women's prisons. The results show that the major factors affecting the decision-making of parole boards are "crime characteristics" and "criminal records." Further, when compared to the parole board of men's prisons, the parole board members of women's prisons pay more attention to inmates' behaviors in prison.