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Space deployable structures with large calibers,high accuracy,and large folding ratios are indispensable equipment in the aerospace field.Given that the single-DOF 3RR-3RRR deployable unit cannot be fully folded,this study proposes a 3UU-3URU deployable unit with two kinds of DOF:folding movement and orientation adjustment.First,based on the G-K formula,the DOF of the 3UU-3URU unit is analyzed.Then,the 3UU-3URU unit is used to construct a deployable truss antenna with a curved surface,and the DOF of the whole deployable antenna containing multiple 3UU-3URU units is calculated.The structural design of a deployable antenna with two loops is carried out with specific parameters and geometric relations.Next,a DOF simulation of a basic combination unit composed of three 3UU-3URU units is performed.Finally,a prototype of the basic combination unit is manufactured,and the DOF of the mechanism is experimentally verified.