The rheological parameters of fresh concrete are mainly characterized by yield stress（τ0） and plastic viscosity（η） which can be determined accurately by shear apparatus with cross stirring vane. Based on self development apparatus, the relationship between torque and revolving speed was derived and formula on calculating rheological parameters was obtained. Test results show that rheological parameters have good consistency with the theory and the experiment values from literatures, and thixotropic performance of concrete mixture can be analyzed quantitatively. Furthermore, the apparatus can meet the requirement of continuous concrete workability determination on construction situ.