Abstract: ‍ ‍With the development of fifth generation （5G） communication technology， realizing effective detection of low-altitude targets by designing integrated radar and communication signal has promising prospects. In this paper， a 5G orthogonal frequency division multiplexing （OFDM） signal design method for radar and communication integration was proposed. Firstly， a transmitted and received signal model was established. When communication information was inserted into the frequency carriers， an interval linear phase compression （ILPC） method was proposed to decrease the insertion impact on the original signal. Then， a multi-objective optimization problem was formulated based on the peak to average power ratio （PAPR）， recovery factor of signal to noise ratio as well as communication bit error rate （BER）， which were constrained by zero cyclic prefix （CP） and time/frequency domain sequence with constant module. As there is a tradeoff between radar performance and communication performance， a time/frequency domain iterative clipping and filtering algorithm was given to solve the optimization problem. Finally， the validity of the proposed method was verified in a typical 5G communication scenario.