This paper deals with distributive regularity of brine with high-boron content (B₂O₃ is higher than 400 mg/1). This paper is based on the data of more than 90 saline lakes obtained from Qinghai-Xizang field obtervations and laboratory studies.The component,water-chemical properties and formative con-ditiont of the brine are also discussed in this paper. It has been discovered that boron not only coexists with Li⁺,K⁺,Mg²⁺,but also is well interrelated to them; but then, the content of boron is inversely proportionate to that of magnestium in carbonate-type's brine. The reason why there is difference of water-chemical components between the brine of Chaidamu Basin and Northern-Xizang is explained here. We also inquired into the material source of the brine rich in B³⁺, Li⁺, K⁺, R⁺, Cs⁺, F⁺, As³⁺, and the contributing factors of high-boron brine.