An experiment of coherent beam combining (CBC) of pulse laser in master oscillator power amplifier (MOPA) configuration using stochastic parallel gradient descent (SPGD) algorithm is reported. An output power of 50 mW is obtained by CBC of two pulse lasers with repetition rate of 10 MHz and pulse duration of 10 ns. When the system evolves from open-loop to closed-loop, the energy encircled in the target is enhanced by a factor of 1.76, and the fringe visibility of the long exposure pattern is increased by a factor of 4.38.