As intangible cultural heritage(ICH)becomes integrated into mainstream society,tourism utilization has emerged as a significant form of ICH preservation,where experience co-creation plays a crucial role in enhancing visitor value and promoting the dissemination of intangible heritage.Building upon existing liter-ature and on-site interviews,this paper proposes a definition of experience co-creation in intangible cultural heritage tourism from a dual perspective of behavior and psychology.It is visitors'utilizing their own re-sources to engage in ICH activities,integrating their resources with those of other actors,and assessing their own contributions through collaborative efforts with other actors.This definition retains the tradi-tional emphasis on visitor participation and interactions among actors while incorporating visitors'psycho-logical experiences during resource input,aiding in understanding the complexity and comprehensiveness of co-creating tourism experiences with intangible heritage.Based on interview data,utilizing the three-level coding process of Grounded Theory,the structural dimensions of co-creating intangible heritage tourism experiences were identified to include interpersonal interactions,perception of contribution,co-production and process control,forming a multi-dimensional concept with rich connotations.Among these dimensions,interpersonal interactions and co-production re-present the behavioral manifestations of co-creating intangible heritage tourism experiences,while percep-tion of contribution and process control signify the psychological sentiments of visitors engaging in co-crea-ting these experiences.Following rigorous scale development procedures,a scale consisting of 4 factors and 17 items was developed,and data analysis indicated the scale's sound reliability and validity.Furthermore,by selecting visitor experience value as the outcome variable,this paper reveals a significant positive impact of co-creating intangible heritage tourism experiences on visitor experience value,suggesting that visitors with more positive attitudes and evaluations towards co-creation activities are more inclined to connect the spirit and cultural symbols of intangible heritage with their self-awareness,thereby attaining higher tourism experience value.In comparison to existing scales for tourism experience co-creation,the scale developed in this paper encompasses both behavioral and psychological aspects of co-creation,presenting a more structured frame-work.The items related to interpersonal interactions not only cover information seeking and sharing but also incorporate responses to visitor needs from destination governments,scenic area managers,and ICH inheritors.Additionally,the measurement of the co-production dimension in co-creating intangible heritage tourism experiences emphasizes the utilization of visitors'existing knowledge,skills,and experiences.The scale development enriches research on the structure and content of co-creating experiences,directly applicable to empirical studies on co-creating intangible heritage tourism experiences and offering insights for the development of co-creation scales in other tourism forms.The research findings provide theoretical guidance for the further integration and development of intangible heritage and tourism,holding practical significance in enhancing visitor experiences related to intangible heritage.