Experimental observations of aeoustie emission (AE) of polymers have been ex-tended in the following aspects：1．Kaiser effect of AE during stretching of a polymer specimen before yielding has been observed for an amor

phous polymer in its glamy state．2．During stretching of an amorphous polymer in its glassy state AE appear-ed in the vieinity of yielding．while in rubbery state AE events were much fewer and weaker and appeared only before break．3．In a temperature jump from room tem-perature to 100℃ both amorphous and semi-crystaline polymers and polymer blends showed AE while not in the sudden cooling to--60℃．4．A polypropylene sample in-jection molded under differeht conditions showed that AE during stretching could re-fleet the quality of molding．