Damage evaluation method is one of the key techniques in structural health monitoring. Research efforts are concentrated on Lamb wave based directional damage quantitative monitoring and evaluation method. Based on linear pb-based lanthanumdoped zirconate titanates (PZT) sensor array and phase information in different sensing signals of PZT elements, phase delay of directional damage reflection could be scanned and detected to decide the orientation and central position of damage. Time reversal damage imaging method is also improved based on linear sensor array tuning after the orientation of the damage is decided to realize the directional damage imaging and evaluation. Experiments on aluminum plate indicate the effect of the new method on damage orientation and dimension quantitative evaluation and the better anti interference and accuracy than existing damage imaging methods.