A stable anionic polyacrylamide(PAM-AMPS) emulsion was prepared by using acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as the reaction monomer,Ammonium Sulphate(AS) aqueous as the dispersed medium of the aqueous two-phase polymerization, Ammonium persulfate and sodium bisulfite redox system as initiators,the Poly 2- acrylamide -2- methyl -1- sodium sulfonate as a steric stabilizer. The structure of PAM-AMPS was confirmed by means of XRD,FTIR,TG and DSC. The PAM-AMPS emulsion was analyzed by TEM and stability analysis.The results show that the copolymer P (AM-AMPS) is an amorphous amorphous molecule with good thermal stability. The stability of PAM-AMPS emulsion was excellent and the PAM-AMPS emulsion destabilisation coefficient(TSI) was less than or equal to 0.4. The copolymer PAM-AMPS is distributed in spherical and elliptical particles in aqueous solution.