A power-equilibrium tunable C+L band Erbium-doped fiber laser is proposed and demonstrated,Which is based on Erbium-doped fiber ring,and a FP filter incorporated with a tunable bandpass filter in the ring.At the same time,the Auto-Power-Control(APC) technique is used to proportion the output power of the laser.With wide tunable range from 1525 nm to 1612 nm,the sidemode suppression ratio of the laser is more than 55 dB.The output power variation is less than +/-0.1 dB over the running range.