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Sound velocity is different in various breast tissues.US image processing assumes a constant speed of sound in human tissue of 1540 m/sec.The speed displacement artifact may arise in B-mode image.As a new physical parameter the sound velocity can be used to form a breast image.Reconstruction of sound velocity distribution has important significance in order to improve the effectiveness in breast cancer detection.At present,these reconstructions typically require a tomographic setup to acquire data from a large number of projections.In this paper we studied the setup with a linear array as used for conventional B-mode imaging,and sound speed reconstruction algorithm.Experiments on synthesis RF data and tissue-mimicking phantom were conducted and analysed.By combining the sound velocity distribution information with the corresponding B-mode image,the diagnosis of tumor may be more accurate and efficient.