Based on analyzing the existing problems of conventional wood drying kiln,two creative techniques,to which have been granted the national inventive patent,were introduced—the device for fans automatically synchro rotation and the device for controlling and adjusting air flow in circulating air supplying system of a wood drying kiln.A steady and even circulating hot air flow,which can be regulated to straight or reverse direction,can be formed to meet the technology requirement of wood drying when these two techniques are applied coordinately.The results of practical applications show that the drying quality of various kinds of wood can be guaranteed,the electric power used in wood drying may be saved greatly,the efficiency of wood drying can be increased effectively,and the maintenance and operation of wood drying kiln can be carried out easily when the new techniques are adopted.