Abstract: The quasi-static elastic imaging technique is based on ultrasonic echo radio frequency (RF) signal before and after compression for the tissue reconstruction. A adaptive algorithm based on priori estimates for the window function is proposed, using the time delay estimation close to the window values as a priori information in displacement estimation process and adjusting the interception window function of the RF signal after the compression, which can improve the correlation between the cross-correlation operations required for pre- and post compression signal segments. The simulation results show that the algorithm not only greatly improves the imaging speed, but also improves the imaging effect at low Signal-to-Noise Ratio (SNR). At the same time, the algorithm has a wider strain passband.