Crystal plasticity finite element method（CPFEM） was adopted to investigate the transverse tensile mechanical properties of single crystal nickel-based superalloy DD6 at 760 ℃. The influence of crystal orientation and loading strain rate on the mechanical properties and deformation characteristics of DD6 alloy were analyzed as well. The results indicate that the calculated constitutive parameters can express the mechanical performance of DD6 well and elastic modulus is increased with the increase of crystal deflection angle under transverse tensile condition. A higher yield stress in the [100] and [110] orientation and a lower yield stress and better ductility in [120] orientation can be obtained due to the various activation of crystal slip system for different orientations. For the same crystal orientation

yield stress and the natural logarithm of strain rate shows a linear relationship under different strain rates.