Nowadays, A huge amount a researchers have a special look on biocompatible and biodegradable material order to find appropriate alternatives for synthetic and environmentally hazardous materials. In this study, it has been tried by addition of cellulose nanofibers, the expected swelling and mechanical properties of starch (for production of super absorbent hydrogel nanocomposite) has been enhanced. Thus, cellulose nanofibres originated from wood of acicular leaf plants were prepared. In this study, pure hydrogel and super absorbent hydrogel based on Starch-g-Poly(acrylic acid) and reinforced by various amount of cellulose nanofibers (1, 3, 5, 7, 9 wt%) ratio to starch, using N,N'- methylene bisacrylamide cross linker by solution method in the presence of potassium persulphate as initiator followed by the polimerization of free radical of acrylic acid monomer on the surface of starch, in the condition of optimized initial effective parameters in order to obtain the best results, were prepared. The prepared gels were freezed using liquid nitrogen followed by the preparation and characterisation of super absorbent polymer drying in freezed state. The optimized value of monomer and cross linker respectively were reported as 3.65 g acrylic acid / 1 g starch and 1.12 wt% compared to monomer. The amount of grafted poly (acrylic acid) on starch surface in hydrogel preparation measured using gravimetric methods was 41%. Since the cellulose naofibres contain the hydrophilic groups, the swelling behaviour of the hydrogel specially for 5% was improved. The swelling of hydrogel containing the 5% of cellulose nanofibres was 523 g water /g absorbent and for the pure hydrogel was obtained 312 g water /g absorbent showing 67% improvement. The percentage of swelling in the presence of various salts after adding the 5% of the cellulose nanofibres was enhanced about 76% and the swelling behaviours was improved about 72% compared to different pHs. Compressive strength and Young's modulus of the hydrogel containing the 5% of the cellulose nanofibres were measured 63.3 and 31.6 kPa indicating the enhancement of the mechanical properties of the hydrogel nanocomposite respectively about 69% and 140%. The density and the amount of swelled volume (dimensionless) of the hydrogel nanocomposite containing 5% of cellulose nanofibres were calculated and measured as 1.01 g/cm 3 and 529.28. Kinetic study revealed higher swelling capacity and less requisite time to obtain equilibrium condition for the hydrogel nano composite. In addition, the good agreement of the swelling behaviour of this hydrogel nanocomposite was investigated using second-order kinetic model and Langmuir adsorption isotherm in adsorption of copper ions (Cu 2+ ). The results obtained from scanning electron microscopy represented the morphological changes of the nanocomposite sue to the addition of cellulose nanofibres well. Keyword: Superabsorbent Hydrogel, Starch, Cellulose nanofibers, Nanocomposite, Swelling