To satisfy the need of a wide working spectral range for spectral-splitting elements in hyperspectral remote sensing applications, a method for suppressing multi-order transmission peaks of tunable Fabry-Perot filter (TFPF) is proposed. According to the phase conditions of transmission maximum occurrence, the effect of multi-order transmission peaks is eliminated by partition of working spectral range, designation of interference order and determination of cavity length variation region of TFPF. The method can effectively extend the free spectral range (FSR) TFPF and make its spectral scanning properties meet the application requirements of hyperspectral remote sensing.