The impedance formula of RL-C parallel resonance circuit is deduced theoretically, and some properties of resonance characteristic curve are analysed.

• 从理论上导出了RL-C并联谐振电路的阻抗公式，由此分析谐振特性曲线性质，并得出文献中引用的RL-C谐振特性曲线成立的充分条件。