Abstract: Usually the main difficulty in determination of trace boron is its unsta-ble recovery in preliminary separation. It is very important to get a lowstable blank of boron. The conventional methods used for purifying boroninvolve distillatory method, extractive method and ion-exchange method etc.Distillatory method is of a good selectivity but too slow. The results fromextractive method are often unstable. In this paper, a low stable blank ofboron and a high sensitivity have been obtained owing to using N-methylglucose complex resin for purifying the reagents, simplifying the separationprocess and choosing the proper quantity of emitting agent. The determina-tion limit (three times standard deviation of blank) is 1.5×10~(-8)g of boron.The precision is ±1.3% for water sample containing 23 ppb boron and±5.9% for uranium compound sample containing 0.143 ppm boron, respecti-vely. At the intercomparison run organized by International Atomic EnergyAdministration (IAEA) in 1984 the results from this method were in agree-ment with the certified value.