Based on the structural characters of printed circuit board (PCB)

a topology optimization model of PCB structure is established.The model consists of two parts

i.e.the supporting part and the PCB component part.The supporting part is simulated by elastic material with no mass

while the PCB component part is refined by condensation method of degree of freedom to reduce computation amount.Based on the model

the sensitivity coefficient for element removal is derived by evolutionary structural optimization (ESO) algorithm

and then an ANSYS-based computational method is presented.Meanwhile

the influence of stiffness of support material on the maximal frequency of structure is studied.In the end

a typical case is illustrated as an optimization example

which demonstrates that the optimization method is reasonable and effective in engineering projects.