A high temperature retarder AA/MAS/CL/TMAAC(AMCT) was synthesized using sodium methylallyl sulfonate（MAS）, hydrophilic long-chain alkene monomer（CL）, acrylic acid（AA） and trimethyiallylammonium（TMAAC） as raw materials. The optimized reaction conditions for synthesizing AMCT were as followed: n(AA): n(MAS): n(CL): n(TMAAC)=4:1:0.15:0.1, the amount of initiator[(NH4)2S2O8] was 4% of the total quality of monomer , the monomers mass concentration were 300g/L, the reaction temperature was 85 ℃ and reaction time is up to 24 h, after all that we got yellow brown viscous liquid. The structures of AMCT were characterized by IR and 1H NMR. The temperature resistance property was investigated by TGA. The temperature and dosage sensibilities were studied according to thickening time and the dispersity and stability were observed by the influence of AMCT on cement slurry rheology behavior. The retarding mechanisms were confirmed by XRD, EDTA titration and LF-NMR. The results indicated that the decomposition temperature of AMCT was approximately 255℃; the temperature and dosage sensibilities of AMCT were accorded with the industrial standard of 《SY/T 5504.1-2005》; AMCT exhibited no harmful effects on dispersity and stability of slurry; the retarding mechanisms of AMCT including self-matching adsorption form coating layer, the rules of inhibiting crystal growth and complexation.