The invention relates to a tunable laser system. The first kind of structure of the system comprises an output light beam collimating lens, a first laser cavity reflector, laser gain media, a collimating lens in a cavity, an active light phase modulator, a first tunable acousto-optic filter, a second tunable acousto-optic filter, a tunable Fabry-Perot filter and a second laser cavity reflector, wherein the first laser cavity reflector, the laser gain media, the collimating lens in the cavity, the active light phase modulator, the first tunable acousto-optic filter, the second tunable acousto-optic filter, the tunable Fabry-Perot filter and the second laser cavity reflector are sequentially installed. According to second kind of structure of the system, a Fabry-Perot etalon with fixed frequency intervals is further arranged in the first structure, so that the frequency bandwidth of laser output light beams is further compressed, and the output light of the laser is made to be uniform with the transmitted spectrum of the Fabry-Perot etalon in peak value. The tunable laser system has the advantages of being reasonable in design, being provided with non-mechanical moving parts, being stable and reliable in performance, low in cost, small in size, and easy to install and produce, and the like.