Abstract: In order to investigate the effects of magnetized water supply on processing tomato growth，NPK nutritional status and yield，a field experiment was carried out in drip irrigation condition.Three treatments of fresh water drip irrigation（CK），250 mT（T250）and 300 mT（T300）magnetization intensity treated water drip irrigation were involved.An obvious effect of magnetic water on processing increasing tomato plant growth and dry weight accumulation was observed.For instance，in contrast to CK，processing tomato dry weight increased by 6.9%～16.9% at fruit setting stage and increased by 8.7%～21.2% at harvest stage with T250～300 magnetic water irrigation treatments，respectively.Meanwhile，numbers of small size fruit（φ＜10 mm）and large size fruit（φ≥10 mm）improved by 23.7%～25.0% and by 7.3%～12.5%，respectively，with comparison with CK at the red ripe stage.Amounts of nitrogen and potassium absorbed were 1.7～1.9 gplant and 3.9～4.0 gplant with magnetic water irrigation treatments.Compared to CK，its values increased by 23.5%～42.2% and by 30.9%～33.1%，respectively.Processing tomato yield（142 065 kghm2）was significantly higher with T300 treatment than CK（129 885 kghm2），and the yield enhanced by 9.4%.In conclusion，there has an obvious effect of 300 mT magnetized water on promoting processing tomato growth，improving plant N and K uptake as well as increasing tomato yield under drip irrigation system.