Polyacrylamide,abbreviation PAM,is a glassy solid,easy to adsorb water ; the absorbing speed are varied with different derivative ions.It is soluble in water and organic solvents as acetic acid,glycol,glycerin and amine.It will be decomposed after long time heating. Decomposed temperature is over 200oC.It can be carbonated into black powder at 210οC without oxygen.It could be made to four series,e.g.,non-ion,cation,anion and mixed cation & anion.