Based on a 979-actuator adaptive optics system, this paper analyzes the different performance of iterative wavefront
reconstruction algorithms. Under the condition of dynamic wavefront errors, the iteration number, storage space and the
number of multiplication of steepest descent method, conjugate gradient method and G-S iterative method are studied.
The steepest descent method and conjugate gradient method need smaller storage space. Both the G-S iterative method
and the conjugate gradient method converge faster than steepest descent method, while the latter takes the least number
of multiplication. Finally, the optimal iterative algorithm is selected considering storage space, iteration numbers and the
number of multiplication.