Abstract: [Objective] The existing capacitor voltage full-feedback scheme for LCL-type inverters presents issues such as inadequate suppression capability for high-order harmonics. To address the contradiction between the actual harmonic suppression effect of the strategy in high frequency band and the stability of the system, an adaptive capacitor voltage full feedback method is proposed in this paper. [Methods] Firstly, the impact of digital time delay on the actual harmonic suppression performance of the capacitor voltage full-feedback scheme was analyzed, and a first-order inertia link was utilized to simulate the phase-frequency characteristics of the digital delay, compensating for phase deviations caused by neglecting digital delay in the full-feedback function. Secondly, virtual impedance correction method was proposed. By introducing an impedance coefficient into the second-order feedback loop, the equivalent virtual resistance was adjusted to ensure the stability of the grid-connected system and the lower limit of impedance coefficients that triggers system instability was theoretically derived. Subsequently, the influence of the impedance coefficient value on the actual harmonic suppression effect of the capacitor voltage full feedback strategy was analyzed. An adaptive impedance coefficient adjustment method was proposed, which was designed to dynamically regulate the impedance coefficient in response to real-time system harmonic content. The function of each module was elaborated in detail, with the specific parameter determination method for critical components provided. Finally, a 10 kVA grid-connected inverter prototype was developed to experimentally validate the efficacy of the proposed adaptive capacitor voltage full feedback scheme. [Results] Experimental results demonstrated that adaptive capacitor voltage full feedback schemes can adjust the impedance coefficient according to the harmonic content of the grid-connected current. This adaptive regulation ensures system stability while maintaining strong suppression efficacy against higher-order harmonics. [Conclusion] The proposed method effectively solves the contradiction between system stability margin and high harmonic suppression effect, significantly enhance the suppression capability of the capacitor voltage full-feedback strategy to high-order harmonics of the grid-connected current, which demonstrates strong applicability in the present weak grid environment with wide range of grid impedance variation and high randomness of harmonic distribution.