This chapter comprehensively discusses the techniques of hepatobiliary ultrasonography, detailing the various preparations before the examination, position selection, and instrument condition settings. It also emphasizes the core technologies such as real-time B-mode ultrasound scanning planes and color Doppler flow imaging, along with their specific applications in disease diagnosis. Furthermore, the chapter introduces special examination techniques, including contrast-enhanced ultrasound (CEUS) and ultrasound elastography. CEUS significantly enhances diagnostic accuracy by intensifying tissue echoes and blood flow signals, while ultrasound elastography holds immense value in the assessment of liver fibrosis. The article underscores the safety, indications, and contraindications of ultrasound contrast agents, and comprehensively elaborates on the temporal phases of liver CEUS and the contrast characteristics of benign and malignant lesions, providing a robust foundation for clinical decision-making. This paper serves as a comprehensive technical guide for hepatobiliary ultrasonography, encompassing not only routine examination modes but also delving into the principles, methods, and clinical values of special examination techniques. The integrated application of these techniques significantly elevates the diagnostic efficiency and accuracy of hepatobiliary diseases, laying a solid foundation for precise patient treatment.