Data acquisition for phased array based structural health monitoring is conducted according to direction in the certain scanning rang of the structure, which affects data acquisition easily by some external factors, such as, environment and the change of the environment and structure. Therefore, the non direction data acquisition for phased array damage identification imaging method is proposed. The same excitation signal is used for all sensors to generate the signals travelling in the structure. The health signals and the damage signals are obtained by the data acquisition method. The damage scattered signals are obtained by comparing the damage signals with the health signals. Based on the phased array theory, the time delay is added to the scattered signals in the signals emission process and the receiving process according to the direction and the sensors. The processed signals are drawn on 2-D mapped image. Experiment on the composite structure shows that the damage in the structure can be well recognized. The method utilizes non direction data acquisition. It can greatly shorten monitoring time and is not affected by the change of environment and structure.