Low Reynolds number flow around a sphere in stratified fluid is numerically simulated to investigate the effect of the stratification on the characteristics of flow over the sphere. The considered Reynolds numbers ranges are from Re=0.01 to 1.0 based on the free stream velocity and sphere diameter, and the considered Prandtl numbers are Pr=0.72,7. And the Rayleigh numbers are in the range from 0.00001 to1.0 , where the Ra is based on the density gradient and sphere diameter. Using numerical simulation, we observed a modification in drag and flow structure due to stratification. The linearly stratified fluids are found to increase the drag and the enhancement linearly depends on the Rayleigh number for very low Ra region. And for large Ra region, the drag coefficient growth rate follows cube root of the Rayleigh number. For inversely stratified fluids case, the drag decr eases for limited range of the Rayleigh numbers.