Dangxiongcuo salt lake, which locates in the southwest plateau of Tibet, has the moderate carbonate-type brine, with the good industrial exploitation prospect and value. The natural evaporation is the basis work of the salt field solar evaporation technology application, and basing on the relative results of the isothermal evaporation experiment of brines indoor, this paper studied the field solar evaporation experiment with brine from Dangxiongcuo salt lake in winter. Through investigating the enrichment of the chemical elements in the liquid and the crystallization regularity of the salt minerals, the collecting and distributing behaviors of Li+, B+, K+ were analyzed in detail, and the controlling conditions of salt separating had also been explored according to the enrichment of the chemical elements, the evaporated water, the crystallization order, variety and amount of the salt precipitated during the evaporation process of brine. By referring to the metastable diagram of the quinary system Na+, K+/CO32-, SO42-, Cl--H2O at 25℃, the crystallization paths and precipitation regularities of salts in the process of solar evaporation with brine from Dangxiongcuo salt lake in winter had been drawn. The crystallization sequence of the primary salts from the solar natural evaporation of brine is Halite (NaCl), Natron (Na2CO3•10H2O), Trona (Na2CO3•NaHCO3•2H2O), Borax (Na2B4O7•10H2O), Sylvite (KCl), Zabuyelite (Li2CO3). Some low-temperature products such as Mirabilite (Na2SO4•10H2O) and Natron can be precipitated or entrained within the mother liquor in advance. The brine rich in Li+ can be prepared through the low-temperature evaporation in winter, and the mother liquor at the later evaporation stage can also be used to extract the Borax and the Sylvite. All these provide the foundation for the engineering design of salt field and brine preparation operation technology for the large-scale exploitation of the valuable resource from Dangxiongcuo salt lake.