Thermally boosted pumping scheme is adopted,pulse laser emission successfully is demonstrated in a slab Nd∶YAG crystal under LD thermally boosted pumping at 885 nm.Theoretical analysis of thermally boosted pumping has been done according to particle transition,experimental comparing between 885 nm thermally boosted pumping and 802 nm traditional pumping has been done.The optical-to-optical conversion efficiency has increased 26% than traditional pumping,and heat generated is about 23% less than traditional pumping.Results reveals that thermally boosted pumping scheme has more advantage in thermal characteristics than traditional pumping scheme.