In this paper an experimental study of automatic tuning system of miniature TEA CO2 laser is presented. By oontrolling of monolithic microprooessca. and programming the laser system is realized to rapid tuning. By monitoring infrared photodectric transducers, system can fix initial pusition of gration accurately. Sin^e-hranch emissicn at two different wavdoigths with time interval ≤10 ms has been obtained. Reappearance of laser wavelength is within 0.1 nm～0.5 nm.