According to the nematicidal potential effect of medical plants, they are considered as potential safe tool in the biocontrol of phytonematodes. This method of nematode management fits well into agricultural practices and integrated pest control programs. The aim of this present study is to investigate the effect of six medical plants; ( Pelargoni‘um gravestone. Darura metal, Simmondisa chinensr's, Cymbopogon citrafus, Thymus vulgaris and An'emisia herbs-aloe) for suppressrng root-knot nematode development under greenhouse conditions. The results reported that Melor‘dogyne incognifa was greatly affected by the previous medical plants and also with there level of intercropping, where they had a pronounced effect on nematode reproduction The Pelergonfum gravealens appears the greatest effect out of the six medical plants used at the level of four plants per pot. Whereas the lowest number of egg-masses and larvae were obtained at the level of intercropping 4 plants per pot. Keywords: Root—knot nematode. Meloidogyne incognlta, medical plants, intercropping levels.