Sonar imaging is one of the simplest technique for detection of under water drowned bodies. There is a need for design of conventional beamforming which are robust and simple. Adaptive beamformer is used to improve the quality of the sonar image. As a result we get an image containing more useful and correct information. The CORDIC computing technique a highly efficient method to compute elementary functions like sine, cosine, translate, rotate values using CORDIC algorithm. The system simulation was carried out using ModelSim and Xilinx ISE Design Suite 9.2i.. Matlab code is used to implement sin and cos using cordic angles and amplitude response of beamformed data by optimized method in order to enlarge the validity region of beamforming. Synthesis results of cordic shows the reduced memory requirement and less power consumption.