Abstract: From the point of view of engineering implementation, several practical problems in the design for signal processing system of coast defense phased array radar are discussed. The effective rate will decrease while realizing stationary target cancellation, adaptive filtering and slowly moving target detection because there are fewer pulses transmitted in a beam and the beam may scan in hopping mode while tracking. To make up for the deficience of pulses, a method to use clutter maps is presented and some problems in implementation are discussed.