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Multi-objective integrated optimization of piezoelectric smart truss with interval parameters is studied.The mass density, elastic modulus and cross-sectional areas of the common metallic connected bars and piezoelectric stack, allowable stress of the common truss elements and maximum voltage of piezoelectric actuator stack are regarded as interval parameters.Based on the quadratic optimal control in the coupling modal space and interval possibility degree, the integrated optimization mathematic model with stress and voltage constraints of piezoelectric smart truss is constructed, where the upper bounds of the structure weight and the quadratic objective function are taken as objective functions and the cross sectional areas of bars, nodal topological design variable, the positions and the number of actuator and control gain are regarded as independent design variables.Through Taylor expansion and interval extension of function, the interval values of the objective functions and the constraint functions can be obtained.Individual validity examination, structural stability examination, controllability examination are introduced to the Pareto CMOPGA on the basis of individual ranking to solve the constraint multi-objective optimization problem.Two examples show that the proposed method is effective and reasonable.