To counter the best season for exploration of metal mineral under forests using imaging spectrometer, the authors made ground tests at the Zhaoyuan gold mine area of China from the end of April to the middle of November 1991. The characteristic wavelength parameters of the red-edge of the average curves for each time was extracted and analyzed. The results indicate that the three characteristic wavelengths for gold mine area show all annually blue shifts in varying degrees against background area, and the blue shifts in Autumn for the first year leaves, and in Spring for the second-year leaves, especially latter, are the biggest; so Spring and Autumn is the best season for the exploration of metal mineral under Korean Pine Forests.
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