Taking 19 plants as experimental material，this paper studies the effects of different accompanying plants on controlling tomato root-knot nematode and promoting tomato growth．The results of preliminary and secondary screening indicated that 4 plants including rape，tillering onion，mint and fennel accompanying tomato could significantly reduce the number of tomato root-knot and its root-knot index．The relative control effect was 58.7%-82.8%．They had no remarkable inhibitory effect on tomato growth．Thus，they can be used as effective accompanying plants to reduce tomato root-knot nematode disease．