The active method has an irreplaceable role in the structural health monitoring research. The article studied the active structural health monitoring method with no wave velocity based on the piezoelectric array. The damage probability calculation method of single pixel dot was given. The active structural damage imaging and locating method without calculating the Lamb wave velocity was also given. Through comparing the conventional method result which uses the experimental calibration velocity with the new method with no wave velocity, it is found that the active monitoring method with no wave velocity can improve the location accuracy and imaging result effectively. The method provides a new industrial application way for structural health monitoring technology based on the piezoelectric array.