Model XCD-1 laser wavemeter is an interferometer with single corner-cube reflector. It can avoid cross-coupling between lasers. A calculator is used for calculation in the circuit. The influence of the lasing interruption of the dye laser can be eliminated by the phase-locked frequency multiplication technique and the envelope detection,automatic resetting. The wavemeter is calibrated with the saturated absorption of the spectral line of 23Na atom. Its absolute accuracy is up to 2 × 10-7.