To protect optical transmitter with a good working environment and a stable optical power sent, this paper designed and accomplished the APC and ATC two circuits, which obtained good results in 10GB/s transfer rate. By alternately using main and spare equipment and timely replacing LD and PD devices, the optical transmitter enable to work stably and reliably in a long-term. With the increasing requirements of SDH synchronous digital transmission system, the improvement of the optical transmitter rate becomes an urgent issue,which could use WDM technology to improve transmission capacity.