Abstract: A segmented wind turbine blade was designed based on a 38-meter commercial blade, and a simulation model of wind turbine was built using the open-source and professional software to study the effects of segment connection on the overall performance of the rotor blade and wind turbine. The cross-section stiffness,mass,deflection,and natural frequencies of the rotor blade,and loads and annual energy production（AEP） of the wind turbine were investigated according to the international standards and engineering technical specifications. The results showed that, after dividing the blade,the first two flap-wise and edge-wise natural frequencies changed within 6% and increased by 2%,respectively;the edge-wise and flap-wise extremely bending moments at root section increased by approximately 10% and 3%,respectively, the edge-wise and flap-wise fatigue bending moments at root section increased by 23.2% and 6.0%,respectively;the power coefficient and AEP did not change obviously.