The invention provides an analytical method of the state running tendency of transmission and distribution equipment. The method comprises the following steps: step 1, building an information model of the transmission and distribution equipment; step 2, selecting operating characteristics of all parts of the equipment in the information model of the transmission and distribution equipment, building a state characteristic space of the transmission and distribution equipment; calculating dynamic deteriorative degree values corresponding to different operating characteristic parameters of all parts of the equipment, using a fuzzy comprehensive evaluation method of a variable weight to obtain an equipment operating state value, so as to obtain a historical operating state sample on a time sequence; step 3, taking the historical operating state sample of the equipment as an original training sample to carry out neural network training based on a PCA (Principal Component Analysis), so as to obtain a neural network model of the operating state tendency analysis of the transmission and distribution equipment. According to the analytical method provided by the invention, the equipment with better operating state can be discovered timely, the support can be provided for the formulation of a reasonable scheme of the daily maintenance and repair of the transmission and distribution equipment.