For code division multiple access, a frequency synthesizer of elementary components is necessary in the system application of frequency hopped spread spectrum communication. This paper proposes the model of N-loop PLL frequency synthesizer to be adaptied for generating the output frequency resultes in the frequency hopping pattern and to be easy in practical application of the system. It was analyzed how the frequency divider ratio distribute, what the method to decide frequency divider ratio is and what relationship of bandwidth of BPF and degree of multiple have is also analyzed in order to hop the desired frequency output.