中介功能的全面性 ,表征于联系功能与阻隔功能的辩证统一。中介唯联系功能观 ,将联系推崇为中介的唯一功能 ,遮蔽了中介的阻隔功能 ,是中介功能规定的全面性的缺失。中介功能的存在方式、中介范畴的基本规定性和中介在实践—认识活动中的功能现实性 ,是中介阻隔功能的不同层面的确证。批判中介唯联系功能观 ,有益于确认中介功能的全面性 ,为中介选择提供方法论前提 ,对正确处理可持续发展中的问题有特殊意义 The comprehensiveness of the intermediary function is characterized by the dialectical unity of the contact function and the barrier function. Intermediary only contact function concept, the contact respected as the only function of the intermediary, blocking the intermediary of the barrier function is the omission of the full range of intermediary function requirements. The existence of intermediary functions, the basic stipulation of intermediary category and the factuality of intermediary in practice-cognition activities are the conclusive evidence of the different layers of intermediary barrier function. It is helpful to confirm the comprehensiveness of intermediary functions and to provide the methodological premise for intermediary choice, which is of special significance to correctly handle the problems in sustainable development