Based on the theory of thermal analysis,heat conduction equation of Nd:GdVO4 crystal slab double-side pumped by laser diode arrays was built. By solving the heat conduction equation,the analytic expression of temperature field and thermal deformation distribution were obtained. As geometry of pumping diodes corresponds to 1 mm×1 mm,and the average power is about 10 W,the distribution of one-dimensional temperature field,two-dimensional temperature field and thermal deformation have great difference when four groups of laser diode arrays were in there different locations;contrasting with the temperature distribution and thermal deformation produces by pump source in three positions,the temperature rise and thermal deformation in the location 1 and 2 are relatively small,while those of the location 3 are biggest.