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Large space truss structures are widely used in spacecraft; Due to its light weight, low stiffness and small damping, it is prone to vibration and deformation under disturbance, which will affect the normal operation of the load and even endanger the safety of the spacecraft; Taking the whole structure of large space truss as the research object, the deformation monitoring method of truss structure is studied; Based on the inverse finite element method, a deformation monitoring method for truss structure is proposed, which reconstructs the deformation of truss structure based on the structural strain measured by sensors; The method is verified by finite element simulation, and the accuracy of deformation reconstruction under the condition of strain valueerror is studied; The results show that the error of structural deformation reconstruction is no more than±3%；when the strain value has random noise ranging from±5%; This method has high deformation reconstruction accuracy and has important reference significance for deformation monitoring of spacecraft truss structure.