This paper reports the high temperature and cycling temperature

ex- periments of EDFA-Ⅲ 95002 and presents data and charts.With alteration of out- put power and gain less than 0.5dB

the pumping was able to work stably and properly.These experiments prove initially that EDFA-Ⅲ can work stably and reli- ably under the environment condition from 0℃ to 50℃ with the advanced characteristics of auto tracing

feedback pump current and real-time supervision. EDFA-Ⅲ is hoped to be used in practical optical communication systems since its technical specifications have been achieved to the international commercial level.