Far field speckle characteristics of a broad area laser diode (LD) and a two-dimension (2D) laser diode array (LDA) made of single diode are measured respectively. A rectangular aperture close to diffuser is used to select different parts of laser light field as illumination spot. The speckle contrast measured for different illumination spots has no obvious trend (turn up or down) along the movement of rectangular aperture. It means that there′s no relationship between contrast and the laser light field selected. 2D LDA made of four LDs produces incoherent light and angular diversity. Adjusting the distance between array and diffuser to change the angular of adjacent incidence into diffuser. The distance from lens to diffuser is fixed. The experimental results shows that, only when the angular is larger than that of imaging lens seen from the diffuser, the contrast of the speckle is reduced by a factor of 1/M.