La(1－x)YbxBO₃(x=1～5%) powde r was synthesized in one step by solution combustion method using La(NO₃)₃、 H₃BO_3and NH₂CH₂CO₂H as reactants and Yb(NO₃)₃·5H₂O as modifier .Body.XRD,SEM,FT-IR and PL analysis were carried out to study the effects of process conditions such as Yb³⁺ doping amount and calcinations time on the phase composition,structure and luminescence properties of LaBO₃:Yb³⁺ powder.T he results show that the calcinations temperature is 900℃,the calcinations time is 4h,the product crystalline is better,and the morphology is uniform. When the doping amount of Yb³⁺ is 3%,the luminescence intensity is the hig hest,and the main peak position of the powder emission spectrum is not changed.Its emission band is mainly located nea r 421nm,and the excitation band is mainly located near 255nm.