Intra-canopy lighting with LEDs are widely applied for high-wire fruit vegetable production and it shows a substantial production improvement.However,further exploring the production potential under intra-canopy lighting system is still stringent in order to save energy.In this study,high-wire tomato plants were grown under intra-canopy lighting thatconstituted of red (peak wavelength at 640 nm) and blue (peak wavelength at 450 nm) LEDs,and combined with overhead supplemental Far-red light (peak wavelength at 735 nm).Plants were exposed to three photoperiods of Far-red light: 6:00-18:00 (FR12),18:00-19:30 (EOD-FR1.5),18:00-18:30 (EOD-FR0.5),and control without supplemental Far-red light.Our data showed that supplemental Far-red light significantly stimulated stem elongation which resulted in a greater plant height.Moreover,Far-red light modified the leaf morphology with a greater leaf length/width ratioand leaf area.The plant architecture modifications that induced by Far-red light resulted in a more homogeneously canopy light distribution.Furthermore,plant total biomass production was increased by 9%~16% under supplemental Far-red light in comparison with control,which led to 7%~12% increases in ripe fruit yield.Interestingly,soluble sugar contents of the ripe tomato fruit slightly decreased with the increasing dosage of Far-red light.Dry matter partitioning to different plant organs were not substantially affected by the Far-red light treatments in general.There were no significant differences observed between the three Far-red light treatments in plant morphology as well as yield and biomass production.This indicates that plants may already reached to the saturation dosage of Far-red light in all treatments.In this context,from the economical point of view,supplementary of low dosage Far-red light at end of day is more favorable,asit uses less electricity but induces similar effects on plant morphology modification and production.