直播电商活动中，主播群体是促进产品销售的核心人群。本研究重点关注品牌网络直播活动中主播群体规模、产品线宽度和品牌类型的匹配对品牌直播销售绩效的影响。本研究收集了2020年8月—12月共18周内化妆品行业中具有代表性的17个奢侈品牌和27个非奢侈品牌的抖音直播销售数据，其中包含261个主播、1,658个产品和3,119场直播。通过采用STATA的双向固定效应模型分析，本研究发现主播群体规模对品牌直播销量有显著的倒U型影响，直播产品线宽度对品牌直播销量有显著的直接正向影响。同时，直播产品线宽度和品牌类型调节了主播群体规模对品牌直播销量的倒U型影响。

In live streaming commerce, the streamer group is the core factor that drives product's sales performance. This study aims to understand how the combinations of streamers volume, product's line breadth, and brand type influence brands'sales performances in live streaming commerce. The study collected panel data on Douyin live streaming platform in an 18-week period from August to December 2020 of 17 luxury brands and 27 non-luxury brands that are representatives of the cosmetics industry, which includes 261 streamers, 1,658 products and 3,119 live broadcasts. We used a two-way fixed effects model with STATA software, and found that streamer volume has a significant inverted U-shaped impact on brands' live sales, and the breadth of product's line has a significantly direct positive impact on brands' live sales. Besides, product's line breadth and brand type moderate the above inverted U-shaped effect.