In order to investigate the efficiency of basil (Ocimum basilicum L.) and sesame (Sesamum indicum  L.) intercropping under long term application of organic fertilizers, a field experiment was carried out in a split plot based on a randomized complete block design with three replications. The main factors included the fertilizer in six levels consisted of 20 and 40 ton ha^-1 of sewage sludge and municipal waste compost enriched with 50% chemical fertilizer needed by soil, chemical fertilizer treatment alone (100 kg ha^-1 of urea, triple super phosphate and potassium sulfate) and control (no fertilizer application) and the sub factors were different planting ratio in five levels consisted P₁: sole cropping of basil, P₂: 75% basil+25% sesame, P₃: 50% basil+50% sesame, P₄: 25% basil+75% sesame and P₅: sole cropping of sesame. Regarding the significant effects of fertilizer and intercropping pattern interaction on ecological yield and land equivalent ratio, the 25% basil+75% sesame and 50% basil+50% sesame had the maximum ecological yield (up to 4091 kg ha^-1) and land equivalent ratio (LER= 1.21 and LER= 1.29, respectively). Also, the most basil and sesame relative crowding coefficient K=1.68 and K= 2.07, respectively was belonged to 40 mg ha^-1 enriched sewage sludge application. Among different intercropping patterns, the highest sesame relative crowding coefficient (K= 1.54) was observed in 25% sesame+75% basil intercropping. The mean comparison of fertilizer and planting ratio interaction effects on basil and sesame relative crowding coefficient indicated that the maximum relative crowding coefficient of basil (A= +0.27) and sesame (A= +0.44) were belonged to the 25% basil+75% sesame and 25% sesame+75% basil, respectively under 40 mg ha^-1 enriched sewage sludge application. In conclusion, sesame in 25% sesame+75% basil and basil in 25% basil+75% sesame under different fertilizer treatments were dominant species and their aggressively value was positive.