Abstract: A method of using Matlab to generate a baseband communication signal analog I/ Q modulation data and the design method to achieve analog communication signals generated by the FPGA+DAC digital squadrature upconverter is preposed in this paper,this method has the advantages of simple circuit , without a specialized analog device. Through this method, the generation of analog communication signals can be realized, which has strong practical value for constructing more complicated electromagnetic environment and realizing intertwined fusion in the fields of Radar electronic warfare and communication electronic warfare.