在智能手机深度嵌入日常交往的背景下，青年在移动社交中逐渐形成关于如何互动的共享规则，并由此影响媒介行为与心理福祉。基于社会技术视角与双过程模型，本文采用两阶段混合研究，首先通过6组焦点小组访谈（N = 36）从日常经验中归纳出四类互动规范：响应性、干扰回避、公开互惠与临场感规范；随后用问卷调查（N = 831）对规范结构进行量化验证，并检验“互动规范→目的性/习惯性手机查看→主观幸福感”的作用路径。结果显示：响应性、公开互惠与临场感规范同时促发目的性手机查看，目的性手机查看与积极情绪相关，进而增强幸福感；干扰回避规范抑制目的性手机查看，并通过消极情绪对幸福感产生负面影响。习惯性查看同时与消极情绪与幸福感相关，呈现双面效应。本研究建构并验证了青年移动社交的互动规范类型，并揭示了社会性互动期待如何转化为个体媒介行为与心理后果，为理解媒介行为的社会性基础及其心理影响提供了机制解释。

With smartphones deeply embedded in everyday interaction, young people develop shared rules for mobile communication that shape media behavior and psychological well-being. Guided by a sociotechnical perspective and a dual-process model, this two-stage mixed-methods study first conducted six focus groups (N = 36) to identify four interaction norms: responsiveness, disturbance avoidance, public reciprocity, and social presence. Then we surveyed 831 respondents to validate the norms and test the pathways from interaction norms to subjective well-being through purposive and habitual phone checking. Results show that responsiveness and social presence increase both purposive and habitual checking; purposive checking is associated with positive affect and, in turn, higher well-being. Disturbance avoidance reduces purposive checking and relates to lower well-being through negative affect. Habitual checking is associated with both negative affect and well-being, indicating a double-edged effect. This study develops and validates a typology of youth mobile interaction norms and clarifies how social expectations translate into individual media practices and psychological outcomes.