The algorithm for calculating unstable energy with high resolution is described. A applied program was designed with the algorithm. Accordingly, the unstable energy, surface pseudoequivalent potential temperature, and lifting condensation level of each surface meteorological station in the research area are calculated and displayed hourly on the Fujian map. A case study shows that convective echoes will develop if there occur convective echoes in three hours in the high unstable energy area or leeward area, the larger the unstable energy, the more intense the weather; and the pseudoequivalent potential temperature chart can reflect precisely the distribution of energy and cold air movement.