It is time-consuming to obtain the matched devices by manual analysis and place them in hand for analog circuits of the mixed signal system.In order to shorten the design cycle

reduce the cost of integrated circuit design

this paper develops the tool for analog integrated circuit layout design automation with C++language.Because the modes of matched device groups in analog circuits are different

according to the characteristics of different matching styles

we edit the corresponding algorithm for automatic placement

so as to shorten the design cycle and reduce design cost.And the experimental results verify the automatic placement algorithm of matched device groups.