In　order　to　further　study　the　distribution　of　residual　strain　in　aortic　arch,　the　open　angles　of　aorta　of　four　rabbits　were　measured　respectively　in　the　experiment.　And　the　data　was　analyzed　by　combining　the　method　of　analysis　on　arterial　walls　and　the　technology　of　image　measuring.　The　distributions　of　open　angle　were　obtained.　The　experiment　has　shown　that　the　open　angle　is　varied　with　the　location　along　aortic　length,　the　variation　in　bending　section　is　greater　than　that　in　straight　section　and　it　is　possible　to　treat　it　as　an　constant;　according　to　the　distribution　and　variation　in　different　directions　along　the　aortic　ring,　it　also　has　shown　that　the　open　angle　doesn＇t　vary　with　the　location　in　the　aortic　ring,　that　is　to　say,　residual　strain　in　arterial　wall　is　even.