In order to enhance the energy intensity of a diode laser in far field,a method is proposed to synthesize the beams of mary diode lasers.Theoretical analysis and simulation with Matlab were made to analysize the effect of the synchronized porformance of the laser on the power density and pulse width.With the use of Zemax,analysis was also made to evaluate the influence of the parallelism of the lasers on the quality of the synthenized beam.The practical experiment prove that the beam synthesis is an effective mean to highten the far field energy density.