According to the antenna sharing requirements of mobile combat platformsa method for allocating the shared aperture of linear array oriented to radar-communication integration is proposed. Firstlya model of the shared aperture is establishedand a non-uniform linear shared array is designed according to the difference in operating frequencies between radar and communication.Secondlythe position allocation of array elements is transformed into a multi-objective optimization problemand the highest sidelobe level of radar array pattern and the channel capacity of communication array element are selected as optimization objectives.Finallythe improved simulated annealing algorithm is applied to optimization calculationand relevant simulation experiments are completed. The simulation results show that the highest peak sidelobe level of radar and the capacity of communication channel can both meet the working requirementsand antenna aperture sharing is realized.