Turns of coil antenna with ferrite core is the most critical parameter when designing receiving coil antennas for wireless magnetic inductive communication. According to the adjustment of turns, the self-inductance, self-resistance, and mutual inductance of the coil will change respectively. Parallel resonance is often used in receiving coils to obtain a considerable induced voltage which supplies for receiving system. In this article, we summarize the parameters of the ferrite coil antenna with its corresponding circuit model and parallel resonance circuit. Moreover, the optimized turns of receiving coil antenna with ferrite core are analyzed. Meanwhile, an experiment has been built to verify the proposed conclusion with calculations. The results show that measurement results are well-matched with calculated ones. Turns of the coil can be optimized to get larger induced voltage and the conclusion will guide for designing coils for wireless magnetic inductive communication.