代与代沟这两个古老的概念在数字化社会的变迁中焕发出新的生命力。本文认为， 代具有生物、社会和家庭三重属性，而媒介则是促成代沟的重要因素。随着数字化媒介 的普及，古老的代沟与新型的数字鸿沟汇聚在一起，成为数字代沟。本文从宏观/国家、 中观/社会和微观/家庭三个层面以及接入沟、使用沟和素养沟三个维度对数字代沟进行 概念化与操作化。基于全国948个家庭祖孙三代共计3282个样本的调查数据，本文对微观 /家庭和中观/社会数字代沟进行了基本的描述与比较，并初步讨论了宏观数字代沟指数 的计算方法。

Generation and generation gap are two ancient concepts but revive in the transition of digital society. This paper argues that generation involves biological, social and family attributes and medium is the key factor triggering generation gap. With the popularity of digital media, the old generation gap combines with the new digital divide to evolve into digital generation gap. We conceptualize and operationalize digital generation gap at three levels (i.e., macro/national, meso/ social and micro/family) and three dimensions (i.e., access, use, and literacy). Based on data from a national survey of 948 families with 3282 respondents, we conducted basic analyses and comparisons of the micro/family and meso/social level of digital generation gap and discussed the way of calculating Digital Generation Gap Index (DGGI) at the macro level.