Abstract: At present,barium sulfate gravimetric method is one of the most common analysis methods for determination of sulfate radical,but by use of traditional barium sulfate gravimetric method may cause deviation to some degree in high boron bittern system.In single factor experiment,effect of borate on determination of sulfate radical by barium sulfate gravimetric method in high boron bittern system was cofirmed firstly.Then effect of amountofsubstance ratio of boron to sulfur,pH,and concentration of barium chloride on determination deviation was investigated respectively by orthogonal experiment in high boron bittern system,and main influence factors and comprehensive influence characteristics were obtained.Among them pH has major influence,and influence of concentration of barium chloride is lower.Influece of amountofsubstance ratio of boron to sulfur is the smallest.All these conditions provide the experimental methods basis on the&nbsp; modification and improvement of the analysis method in the high boron bittern system.<BR>