The adaptation of transmitted waveform can enhance radar performances in detection, track, anti-jamming, etc. But the performance of this technique is linked with the prior knowledge of the radar target and clutters. In theory, the adaptive method of transmitted waveform based on maximum output signal-to-clutter-noise ratio (SCNR) criterion has been proved to be feasible and effective. In this paper, for enhancing practical application value of this adaptive method, the performance of the transmitted waveform adaptation method was verified by utilizing the prior knowledge of targets and clutters provided by Swerling statistic model and the digital elevation model (DEM) in airborne phased array radar. The simulation results show that the transmitted waveform can adaptively vary with the change of target and clutter for achieving the optimal matching of the two. Therefore, this method is better than the traditional methods in increasing output SCNRs of radar. It has good practical application prospects.