Abstract: In order to effectively monitor the hydraulic fracturing effect and improve the evaluation accuracy of reservoir fracturing, an evaluation method of the downhole fracturing effect based on array acoustic logging data was adopted. The extraction and imaging technologies of reflected Stoneley wave were used to quantitatively characterize near-wellbore fractures, and a pre-stack depth migration imaging algorithm suitable for logging observation systems was proposed, achieving high-precision imaging of fractures in far from wells. In addition, an evaluation method of multi-scale fracturing effect based on array acoustic logging was developed and applied in horizontal well X1 in an oilfield in western China. The results show that the development degree of fractures evaluated based on array acoustic logging data is positively correlated with the injection amount of fracturing fluid, and the most developed zone of fractures is consistent with the development location of natural fractures in the seismic ant attribute map. The evaluation method of the downhole fracturing effect based on array acoustic logging is of great significance to characterize the development of fractures of different scales within tens of meters around the well, and it has certain guiding significance to better play the supporting role of hydraulic fracturing technologies for energy exploration and development industry.