Abstract: In order to satisfy the teaching needs of high frequency double tuning resonance amplifier circuit absent in the communication electronic experiment teaching, the coupling characteristics of capacitor parallel double circuit in high-frequency double tuned amplifier are theoretically deduced and mathematically analyzed, and the two-dimensional and three-dimensional detailed analysis diagrams of its normalized frequency characteristic function are given. It is proposed that the passband has two states of continuous and discrete distribution, and the hardware experimental circuit of double tuned amplifier is designed to verify its correctness. Through the experimental circuit, students can thoroughly understand the principle of high-frequency small signal resonant amplification circuit and master the circuit design method.