In view of the frequently-occurring problems in wind farm fault diagnosis， such as closure， limitations， and hysteresis， a kind of wind farm fault diagnosis support system framework（WFDSS） is proposed based on the services oriented network architecture（SONA）to realize wind farm remote fault diagnosis. An analysis is made of the WFDSS hierarchical framework， the whole WFDSS deployment is rationally planned， the system structure of the diagnosis system platform is designed， the functions of the platform modules are expounded， and the process of specific diagnosis is described. The secure sockets layer（SSL）virtual private network（VPN） technology is adopted to build a safe tunnel from the outer network to the wind farm network to access the wind farm servers data by logging in the SSL proxy server， realizing remote monitoring and diagnosis of the wind farm.