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During a wind tunnel test, a crack occurred on the weld line between the support structure and the hydraulic cylinder of a regulating valve.After an analysis on its stress, the reason for the production of crack found.The support structure consists of two parallel steel plates which were welded to the circular support ring on the inner of the shell of the regulating valve.Due to the existence of a closet, one of the steel plates can be welded completely to the inner of shell, however, the stress here reaches its maximum, thus, the crack occurred.To solve this problem, the support structure was optimized on the basis of stress analysis, and a new structure of cross form was obtained, which eliminate the existence of closet, and all the weld lines are complete.In this paper, the new support structure is described in details, and calculated using the finite element software, and compared with original structure.The analysis results show that at same conditions, the optimization structure has smaller maximum stress less than subdued strength of material.It is also tested in the process that the optimized structure is easy to make and the welding technique becomes quite simpler.In the later application, the support structure was not damaged any more.