Abstract: A preliminary analysis has been carried out with the multinomial as the mathermatic model on the trend-surface components of the mineralization of Bosten Lake, and a relatively good reault has been abtained. The patten of the mineralization is dominated by the entering stream and salt as well as the lake circulation. Furthermore the trend-surface shows the dispersing and diffusion path of the flowing-in water mass and salt, and, hydrologically, its motion state is therefore demonstrated clearly within the top water strata of the lake.