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Polycrystalline BAsx (x =0.80-1.10) compounds with different boron-to-arsenic elemental molar ratios were synthesized by a high-pressure and high-temperature sintering method.Compared with other ambient-pressure synthesis methods,high pressure can significantly promote the reaction speed as well as the reaction yield.As the content of arsenic increases from x =0.91 to 1.10,the thermal conductivity of BAss gradually increases from 53 to 65 W.m-1.K-1.Furthermore,the temperature dependence of thermal conductivities of these samples reveals an Umklapp scattering due to the increasing phonon population.This work provides a highly efficient method for polycrystalline BAs synthesis.