Abstract: Pulsed eddy current testing (PECT) is a new nondestructive testing technology developed in recent years. Selection of appropriate parameters of excitation signals for PECT method has important effect on pickup signals. In this paper, the efficient numerical solver of PECT is developed based on frequency domain summation method at first. Then, the influences of fundamental frequency, duty ratio, pulsed rising time and falling time on detection sensitivity are investigated. In addition, the reason of the influences is analyzed from the viewpoint of frequency spectrum characteristics of excitation signals. Finally, the principle of how to choose appropriate fundamental frequency and duty ratio is proposed.