Abstract: The rheological behaviour of AN g casein concentrated solution has been determined with a capillary rheometer. The results show that AN g casein concentrated solution is a kind of non Newtonian shear thinning fluid. The end correction factors at varied shear rate have been determined using capillaries of different length to radius ratio. The end correction factor increases with the increase of shear rate. The graft macromolecular sheaflike structure is formed and its stretching motion is limited as shear rate become higher, then the increase of value of end correction e tends towards the maximum. The real shear rate makes up only about 35 per cent of the total apparent shear rate when shear rate is higher and capillary ratio of length to radius is lower. It shows clearly that the end correction is necessary when rheology parameters are discussed.