A scheme is proposed to explore the absorption and susceptibility of hybrid quantum systems comprising superconducting qubits and two mechanical resonators. The results show that the transparency based on mechanically induced coherent population oscillation (MICPO) can be tuned by the Rabi frequency and decay rate of the mechanical resonator. We also demonstrate that the coupling strength between the two mechanical resonators can be detected by measuring the distance between two peaks in the probe spectrum. We also propose a new scheme for measuring the frequency of mechanical resonators. This study is of great significance in the fields of precision measurement and quantum information processing.