The thermal analogy is presented to predict the static behaviour of composite rotor blade with distributed piezoelectric Macro-Fiber Composite actuators. Based on the analogy between the converse piezoelectric effect and thermoelastic effect, an applied electric field is modelled as a thermal load and piezoelectric coefficients characterizing an actuator are introduced as thermal expansion coefficients. The application of this method is discussed using a cantilever composite rotor blade with surface bonded Macro-Fiber composite actuators. The results in terms of static response obtained from the model based on thermal analogy are compared with the results of experiment by German Aerospace Centre (DLR). DLR developed a demonstrator blade with a rotor radius 2 m. The helicopter rotor blade consists of C-spar made of unidirectional glass-fiber reinforced plastic (UD GFRP), skin made of ±450 GFRP, foam core and MFC actuators. The experimental twist deformation of blade is obtained using MFC embedded in the composite blade construction. These actuators are situated at the top and bottoms of helicopter rotor blades and oriented at ±450 to the spanwise axis of the rotor blade. Electric field activates the piezoelectric effect in the piezoceramic fibers of MFC, which elongate along the length of fibers and thus distribute a twisting movement along the blade. Modelling a voltage actuation with a piezoelectric Macro-Fiber Composite actuators based on the thermal analogy was performed in ANSYS finite element program. The finite element model of rotor blade was built using ANSYS two different types of elements: linear layered structural shell elements SHELL 99 and structural solid elements SOLID 186, which was used to model the different components of blade. The rotor blade skins and MFC are modelled by shell elements (SHELL99) and foam with 3D 20-node structural solid elements (SOLID186). The spar is modelled by shell and solid elements. Excellent agreement is observed and it is concluded that the use of thermal analogy to simulate the static behaviour of piezoelectric structures leads to promising results.