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Nowadays more and more attentions are paid to fruit quality in the production of tomato. In order to better understand the effects of deficit irrigation on tomato yield and fruit quality, four years of deficit irrigation experiments were investigated to simulate water-yield and water-fruit quality relationships of tomato in greenhouses. The yield and fruit quality parameters like total soluble solids (TSS), reducing sugars (RS), organic acids (OA), sugar/acid content ratio (SAR), vitamin C (VC), firmness (Fn), color index (CI) were correlated with seasonal evapotranspiration (ET) and ET deficit at flowering and fruit development stage (Stage II) and fruit ripening stage (Stage III) using linear regression. Three water-yield models (Jensen, Stewart, Minhas) and three water-fruit quality models (multiplicative, additive, exponential) were applied to simulate the relationships of tomato yield and fruit quality parameters with water deficit at …