For the stress measurement and state evaluation of the first item before batch production of complex shell structural parts，the stress and strain variation condition of key parts in the shell hydraulic test should be checked out as soon as possible. The test data has been processed to obtain the stress value of key parts under corresponding working state so as to accumulate the strength analysis and design simulation data of structural parts. According to the design requirements，stress and strain tests have been conducted on 15 positions of the shell. The position with the largest stress value can be found through calculation. This research has found that the test results are less than the yield strength of corresponding materials，and the shell structure design meets the underwater pressure requirements.
