Objective To analyze the situational characteristics of Patient and Visitor Violence (PVV) based on the situational information flow and conversion process between nurses and patients, so as to provide references for identifying risk factors and redu-cing PVV incidence. Methods A descriptive qualitative study was designed.Thirty-two patients or visitors who committed PVV and 32 nurses who experienced PVV were selected by purposive sampling during medical visits to conduct narrative paired interviews, and the interview data were analyzed using content analysis method. Results Three themes and fifteen sub-themes were extracted:ineffective flow of situational information (treatment process information, nursing operation information, refusal behavior information, medical cost information, institutional information), ineffective flow of emotional interaction (emotional information with failed reception, emotional needs with response deviation), and ineffective flow of situational information delivery methods (over-commitment, responsibility-shifting, inappropriate tone, inappropriate body language, one-way notification, ambiguous expression, mistimed delivery, lack of focus). Conclusion Nursing administrators should take measures to enhance the completeness and accuracy of information delivery by nurses, increase emotional interaction between nurses and patients, and strengthen nurses′ communication skills, thereby facilitating effective situational information flow and reducing PVV incidence.