In order to study the effects of chemical and biological fertilizers on yield and yield components of fennel an field experiment was conducted in Agricultural Facultyof ShahidChamranUniversity of Ahvaz2011. In trial study was carried out as a two-waysfactorial which was assigned as randomized complete block design (RCBD) with three replications. Chemical fertilizers at three levels (C1=0-0-0 kg/ha NPK, C2=60-60-48 kg/ha NPK and C3=120-120-96 kg/ha NPK)were the first factor, anddifferent biologicalfertilizers at six levels B1=control,B2=Biosuperphosphate+Nitroxin,B3=Nitroxin,B4=Biosuperphosphate,B5=Biosulphur and B6=Sugar cane waste compost) were the second factor.The result showed that chemical fertilizer had significant effect on all traits except secondary branches number,number of sub-umble in umbel, seed number at sub-umbel,seed weight and harvest index traits. So that by increasing chemical fertilizer rates until(120-120-96 kg/ha NPK), all measurement traits were increased.The biological fertilizers had significant effect on all traits except secondary branches number1000 seeds weight and harvest index traits.So that the highest number of umbel per plant and seed number at sub- umbel,biological and grian yield were obtained at sugar cane waste compost. The highest sub-umbel per umbel was obtained at Nitroxin + Bio superphosphate.Moreover, the interaction result showed that the highest(237.7 kg/ha) and the lowest(103.2 kg/ha)fennel grain yields were obtained at sugar cane waste in combination with 120-120-96 kg/ha NPK. In general, the result showed that the application of biofertilzers in combination with chemical fertilizers can improved the grain yield and yield components of the fennel.