This paper investigates a high power all fiber ultrashort pulse laser system. This system consists of a mode-locking laser oscillator, a multi-stage amplifier, a pulse selector, and a paired grating pulse compressor. With pulse energy of 12 uJ at repetition rate of 30 kHz, the laser at center wavelength of 1.05 um was obtained. Pulse width of 525 fs was achieved after the grating pair compressor.