The performance of target-in-the-loop adaptive optical systems based on fiber laser array in atmospheric environment has been investigated. A theoretic mode of target-in-the-loop adaptive optical systems based on fiber laser array has been set up. The effects of the systems on turbulence compensation under different turbulence intensity are studied and the optimization of the control algorithm is discussed briefly. It is shown that the system can compensate the effect of turbulence effectively and improve the power density concentration by reducing the mean radius of the spot on the target by 9%. The performance of the system is affected by the intensity of the turbulence and the convergence rate of the control algorithm depends on the parameters of the algorithm. Finally the signal-to-noise ratio (SNR) of the detector also affect the performance of the system.