Abstract: Three (2-hydroxy-3-chloro)propylalkoxy ether compounds were prepared by the reactions of epichlorohydrin with n-butanol，iso-octanol， n-dodecanol respectively，and borontrifluorideethercomplex as catalyst.Then，using the three compounds we prapared ， respectively reacted with 2 - (2，4-dihydroxyphenyl)-2H-benzotriazole or 2 - (2，4-dihydroxyphenyl) -5 - chloro-2H-benzotriazole，six 2-[2 -hydroxy-4 -(2-hydroxy-3-alkoxy)propylphenyl]-(5-chloro-)2H-benzotriazole compounds(IIa，IIb，IIc，IIIa，IIIb，IIIc) were synthesized as type of resorcinol derivative，the yields were 83％，79％，78％，85％，74％and 77％ respectively. The target products were characterized by IR and MS，and tested by ultraviolet absorption spectrum ，all the six compounds have relatively strong absorption peak in 250 ~ 400 nm wavelength range.Maximum molar extinction coefficient(εmax) of compounds IIa，IIb，IIc，IIIa，IIIb and IIIc) was 23190.1Lmol-1cm-1(λmax=338.5nm)，23016.3Lmol-1cm-1(λmax=341.5nm)，23895.1 Lmol-1cm-1(λmax=339nm)，24368.0 Lmol-1cm-1(λmax=346.5nm)，22522.6 Lmol-1cm-1(λmax=346.5nm) and 25104.5 Lmol-1cm-1(λmax=347nm) .They were a kind of more efficient UV absorbers ，compared with the traditional UV absorber UV-P(εmax=16177.7 Lmol-1cm-1，λmax=338.5nm) .