The invention relates to the technical field of ultrasonic imaging, in particular to ultrasonic diagnosis and an imaging method thereof. The method comprises the following steps of 1 image collecting, 2 image postprocessing, 3 three-dimensional reconstructing, 4 three-dimensional image displaying and 5 three-dimensional quantitative measuring. The method has the advantages that the sampling time is short, sampling can be completed within one breath-holding period of a patient, and an error caused by viscera organ moving is avoided; the vascular structure can be displayed without needing an intravenous injection contrast agent, and ionizing radiation and wounds do not exist; the method is economical and convenient, the reliance on the technical level of an operator is reduced, and the repeatability is enhanced.