Due to some problems such as soil born pathogens, lake of suitable soils, shortage of fresh water for irrigation and better control on environmental factor, cursing hydroponic methods for vegetable production is increasing in the world. Generally, hydroponic systems can be divided into two groups according to its media: liquid media and aggregate substrate. The second type is more common. Besides their characteristics such as good draining, high water holding capacity, high ionic exchange and lack of weed growth, pests and pathogens, media should be also cheap, accessibility of using saw dust and their combination with pumice and bentunite in soilless system as growing media and their effects on growth, yield, fruit quality, and nutrient concentration of bell pepper (Capsicum annuum L.) A greenhouse experiment was conducted using a randomized complete block design with eight treatments, four replications and two plants in each replication. Treatments (growing media) were consisted of: saw dust (100%), saw dust (95%)+ pumice (5%), saw dust(9%)+ pumice (10%), saw dust (85%)+pumice (15%), Saw dust (95%)+bentunit (5%), saw dust (90%)+bentunite(10%), sawdust (85%)+bentunite (15%) and a common planting bed (85%peat+15%perlite) as a control. Seedlings were tralanted at 3 true leaves into 7-litre volume pots filled with different substrates. Water and nutrient requirements of the plants were supplied using Johnson nutrient solution (50%), applied with a drip irrigation system. Seven months after tralanting, the following parameters were measured; vegetative growth, yield, fruits quality. The results showed that the highest fresh and dry weight of shoots, root dry weight, the earliest flowering and fruiting as well as color formation was recorded with saw dust (85%)+pumice (15%). The results also demonstrated that after Peat the highest content of chlorophyll was recorded with saw dust (95%)+pumice (5%) and then saw dust (90%)+bentunite (10%) different media caused no significant effect on fruit number per plant fruit fresh weight and yield, however saw dust (90%)+pumice (10%) after peat caused the highest number of fruits per plants. Also, saw dust (85%)+pumice (15%) after peat caused the highest yield as demonstrated no significant different with peat and pure saw dust. The highest fruit length after peat was related to sawdust (95%)+pumice (5%) and the lowest fruit length was recorded with pure saw dust. The highest fruit diameter was recorded with saw dust (90%)+bentunite (10%) but the lowest fruit diameter after peat was related to saw dust (85%)+bentunit (15%). The highest fruit lobe was recorded with saw dust (90%)+pumice (10%) and the lowest fruit lobe was observed with saw dust (85%)+bentunit (15%) the results also showed that , although, the thickness of fruit pericarp non significantly was affected with media, the highest was recorded with sawdust (90%)+bentunit (10%) and the lowest was observed with saw dust (85%)+pumice(15%) after peat also saw dust (90%)+bentunite caused the highest amount of vitamin C and TSS and saw dust (90%)+bentunit (10%) caused the lowest amount of vitamin C besides, the results showed that the highest level of K in leafs was recorded with saw dust (90%)+bentunit (10%) and the highest level of Ca in the leafs was related to sawdust (95%)+pumice (5%). Totally, the results showed that after peat, in the most cases the plants cultured in the medium containiy saw dust and pumice 15% showed the better vegetative and reproductive growth than the plants in pure saw dust and saw dust plus bentunit. Key words: Bell pepper cultivars, Saw dust, Growing substrate, Bentuni, Pumice.