The　circuit　of　counting　interfering　fringes　was　designed　with　single-chip　computer　for　Michelson-interferometer-based　laser　wave-meter.　The　program　was　written　for　fringe-counting　with　two　8254　counters　and　wavelength-calculating　with　Keil　C51.　The　two　8254　counters　can　automatically　be　started　to　count　pulses　at　the　same　time　while　falling　edge　of　pulse　signal　of　reference　laser　arrives　under　the　control　of　single-chip　computer.　Both　two　counters　can　be　locked　also　simultaneously　at　the　falling　edge　of　signal　of　reference　laser　after　the　number　of　pulse　signal　of　reference　laser　is　counted　up　to　1.5　million.　As　soon　as　the　lock　signal　arrives,　the　counter　numbers　of　two　8254　can　be　read　and　wavelength　can　be　calculated　by　single-chip　computer.　Furthermore,　average　wavelength　can　be　gotten　by　shift-meaning　of　10　times　and　displayed　on　LCD　with　7　bits　in　decimal.　Two　frequency-stabilized　lasers　of　633　run　and　532　nm　were　measured　in　practice,　and　the　experimental　results　indicate　its　measurement　accuracy　is　2　×　10-7　with　this　design.