Involuntary autobiographical memories(IAMs) refer to memory phenomena that haveno purpose, plan, or will to extract personal experiences. This study explored the involuntaryautobiographical memories of 160 undergraduates(high and low self-identity groups) throughpsychological tests and alert tasks plus lexical cues. The results showed that: (1) There was no significantdifference in the involuntary autobiographical memory quantity between the two different self-identitygroups. (2) In terms of quality, the IAMs of high and low self-identity groups differed significantly inrecall frequency, vividness and face. The IAMs of high self-identity group scored higher than those oflow self-identity group in recall frequency, vividness and face. There were no significant differencesbetween the high and low self-identity groups in terms of the sudden degree of entering the mind, thedegree of pleasure at that time, the degree of pleasure at thought, the relationship between gain and loss,the relationship between success and failure, the concreteness, the degree of regret and the relationshipbetween decision-making of IAMs. (3) In terms of self-function and social function, there were significantdifferences between the high and low self-identity groups and the scores of high self-identity group werehigher than those of low self-identity group. In terms of guidance function, there was no significantdifference between the high and low self-identity groups. Conclusion: Self-identity has an effect on thequality, self-function and social function of involuntary autobiographical memory, while self-identity hasno effect on the quantity and guidance function of involuntary autobiographical memory.