Metaphores are considered as one of the most common functions of language and due to their abstract meaning, they can be used to study the performance of patients suffering from cognitive deficits. This research aimed at investigating dead and novel metaphor comprehension in Persian-speaking Alzheimer’s patients, and analyzing the role of executive function in this process. This research has taken advantage of co-relational methods. The sample society is composed of 5 Persian-speaking Alzheimer’s patients whose age and education matched healthy controls. To assess patients’ executive abilities and metaphor comprehension, stroop color, clock drawing and metaphor comprehension tests were used respectively. The results showed Alzheimer’s patients’ deficit in metaphor comprehension, particularly in the novel ones. Patients’ performance in metaphor comprehension was related with theirs in stroop color test and clock drawing tests, although this correlation was more significant in the case of novel metaphors. On the one hand, the relationship between patients’ metaphor comprehension and their executive abilities demonstrated that deficit in executive system plays an important role in patients’ poor metaphor comprehension. On the other hand, this highlights the significant role of pre-frontal cortex in metaphor comprehension.