Palpation and elastography are common diagnosis methods that detect tissue hardenability and reflect pathological status. Ultrasonic elastography is one of the existing highly developed tissue elastographies. Photoacoustic imaging uses photoacoustic signals generated by tissues that absorb pulsed light for imaging, combining the advantages of optical imaging with high selectivity and pure ultrasound imaging with high imaging depth. Elastic imaging transforms the elastic information of the material into images, which is divided into several steps such as induced deformation, deformation measurement and image formation. The mechanism and technique of elasticity detection and imaging based on photoacoustic technology have been reported, and the research results of current photoacoustic elasticity detection are reviewed. On this basis, the photoacoustic signal itself is generated by tissue thermoelastic deformation of the ultrasound, that is, the transmission of ultrasound is related to tissue elastic properties. Photoacoustic signal analysis of tissue elasticity analysis is proposed. Which combines photoacoustic function to realize multi-function imaging of function and elasticity. The proposed method can provide more accurate information for the diagnosis and treatment of diseases, especially tumors.