Abstract: A deployable parabolic reflector of truss mesh antenna i s described.The antenna has the characters of high deployed/stowed ratio,small a rea mass density and broadband frequency.It can be used for Synthetic Aperture R ader(SAR)antenna of small satellite and other S or L band antenna such as mobile satellite antenna.Deployable dimension of the parabolic reflector is 6m×2 8m. The frequency is S band with bandwidth greater than 100MHz.The antenna configura tions and structure design of the key parts are introduced,and the shape error a ssigning,thermal distortion and stiffness is analyzed.The test results of labora tory model show the structure design is practicable and feasible.