The 3～5μmmid infrared laser has a wide application prospect in remote sensing,communication,gas detection,medical treatment and other fields.Having the advantages of uncomplicated theory and simple structure,directly pumping solid state lasers are important methods to emit 3～5μmmid infrared laser.There are two kinds of directly pumping solid state lasers,mainly distinguished by their gaining mediums,one is based on rare earth ions(such as Er 3+,Ho 3+,Dy 3+,Pr 3+)doped solid state lasers,and the other is transition metal ions doped solid state lasers.The recent progresses of directly pumping solid state lasers are introduced and their technical principles and future developments are summarized in this paper.