Abstract:The experiment was carried out with two grape varieties, ’Kyoho’ (Vitis vinifera × V. labrusca) and ’Early Agatc’ (V. vinifera), and with five different canopy structures through which a series of different canopy PAR interception and distribution types were established, in vineyards of Beijing area (North China) during 1988—1992. The results showed that there existed significant or very significant positive linear correlations between canopy PAR interception and net photosynthetic rate, between canopy PAR interception rate (PFRL) [and single leaf (PFRI)] and the percentages of total fruit dry weight in aerial biomass dry weight, between PFRL (and PFRI) and the contents of total berry sugar in fruit, and between PFRL (and PFRI) and the millesmal values of total anthocyanin production in the sink to total fruit dry weight. It suggested that varying canopy PAR interception and distribution through management of canopy structure of vineyards could regulate efficiently photosynthate “sink-source” relation of vines and metabolic direction in grape berry. The canopy having a high PAR interception and a good PAR distribution in the canopy could not only supply grapevine with a full photoassimilate “source” to satisfy the needs for grape yield and quality, but also permit a higher partitioning coefficient of photoassimilate to fruits by regulating the “sink” relations between organs, and be favourable for the biochemical comosition of berry quality in metablism of fruit.