Under conditions of hydrochloric acid aqueous solution，long-chain alkyl dimethyl tertiary amine, epichlorohydrin as the main raw material，synthesised a series of 1,3-bis (alkyl dimethyl ammonium chloride) isopropanol Gemini quaternary ammonium salt , m-3(OH)-m ,(m= C8、C10、C12、C14、C16、C18)with one-pot method. Melting point as a method for the study to detect the purity of Gemini quaternary ammonium salt m-3(OH)-m. In C12-3（OH）- C12 case, FT-IR and 1HNMR are adopted to structural characterization. Surface tension was measured at various concentrations,foaming ability and emulsifying ability were measured in 0.1% aqueous solution. The results shows：With the change of m, surfactant, foaming power and emulsifying capacity shows a regular change for each compound. The CMC and γcmc of each compound respectively were 0.09、0.075、0.03、0.024、0.026、0.14 mML-1 and 54.01、32.56、25.74、29.41、30.51、30.28 mNm-1 in the order of m=C8、C10、C12、C14、C16、C18. Foaming capacity and foaming stability showed better results at m=C10 and m=C12. Emulsifying capacity revled the better result at m= C14.