Abstract: In modern DOA system,a large number of DSPs are needed and the system design is very complexity and its real-time performance is not very good.Because of this,an advanced algorithm for realizing 2-D DOA(2D FD-Root-MUSIC) based on FPGA and DSP is studied in this paper.Firstly,the problem of quantification errors and cal-culation errors is anayzed before the algorithm is realized on hardware platform,and the flow of fixed-point simulation is introduced.Then,the number of the fixed-point data is fixed on quantizing float data simulation.Finally,according to the result of quantized float data simulation,the fixed-point structure of covariance matrix,noise subspace,spatial spectrum value and FFT are designed.The speeds of calculating and resources needed are also analyzed.Simulation re-sults show that the advanced algorithm can be realized more quickly and efficiently after parallel processing.