Multi-scale　electron　microscopy　characterization　of　the　{332}＜113　＞　beta　twins　produced　in　the　necking　region　near　fracture　surface　of　the　deformed　beta-type　Ti-42Nb　(wt%)　alloy　have　been　carried　out.　A　unique　kind　of　bandshaped　zone　with　plenty　of　laths　of　two　alpha　＇＇　martensitic　subvariants　distributed　in　about　90　degrees　crossing　directions　has　been　found　to　be　formed　in　the　{332}＜113　＞　beta　deformation　twin　along　the　twin　boundary.　This　finding　clearly　reveals　that　intense　local　stress　concentration　and　its　complex　accommodation　process　associated　with　the　beta-to-alpha　＇＇　and　alpha　＇＇-to-beta　structural　transitions　can　occur　specially　in　the　twinned　region　of　stress-induced　alpha　＇＇　martensite　phase　along　its　boundary　for　the　beta　Ti　alloy　subjected　to　instable　deformation.　It　is　also　clearly　indicated　that　the　local　stress　accommodation　due　to　the　alpha＂-to-beta　structural　transition　can　be　unsymmetrical　with　respect　to　the　twin　boundary.