Many researches in Psychology found the sunk cost influences the investment decisions of decision-makers, but the effect of the sunk cost is also depends on other factors. This study attempts to analyze whether the managerial accounting knowledge and the financial incentive mitigate the sunk cost effect or not. 193 college students were used as participants in the experiment. The results showed that (1) the cognitive effort of participants increases when the financial incentives are provided, (2) the financial incentives have no influence on participants’ decisions, (3) the percentage of correct decisions that participants with (without) managerial accounting knowledge make is higher (lower).