A new kind of alkylammonium benzoylbenzoate (BPAA)，including primary and tertiary amines with different length of hydrocarbon chain，was synthesized in this paper．The experimental results show that photophysical properties of alkylammonium benzoyl-benzoate (BPAA) are identical with simple benzophenone

these BPAA with long hydrocar-bon chain are characteristic of amphiphilic property and can aggregate into reversed micelles in non aqueous solution．The results obtained indicate that polymerization rates (Rp) of MMA initiated by BPAA/TEA are greatly faster than that initiated by simple BP/TEA at the same concentration COndition in which tertiary amiRe salts of BPAA shoW higher activities related with the corresponding primary amine salts

polymerization rates for BPAA compounds with long-chain are remarkably higher than those with short chain．By comparison of the polymer-ization rates obtained under O2 and N2 different conditions，it shows that rate enhancement by O2 for BPAA leads to increase obviously in the rate above two times higher than that for BP．The influence of concentration of each BPAA/TEA photoinitiation system is also performed．