This paper introduced with emphasis the physiological meaning of hydraulic architecture and its parameters, e.g., hydraulic conductivity(Kh), specific conductivity(Ks), leaf specific conductivity(LSC), Huber value(Hv) and water storage capacitance(C), the hydraulic architecture patterns of woods and woody plants, and the developmental trend in their research. The relationship between the hydraulic archteciture of woody plants and their drought resistance was tried to be expounded in mechanism.