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ln the present paper. ww have performecl experimentally the tensile deformations of a Zn-22wt%Al allcy in a silicen oil bath. VVe analyze the Toeal delbrmation and evsluate the superplastic propenies at the divided small part in a specimen. The ternperature changes at the small parts are also measured duting the deformation, The local devformatiens increased with decrease of the strain-rate and increase of the test temper2ture, the necking cliffused widely ln the who[e gauge length end the superplastic defbrmation became mere svitable. When the specimen was deformed at a higher straln-rate, the speed ef the temperature increase became higher.