The laser protective technology against intensity,which is based on the nonlinear optical effect and phase transition effect,can protect the human eyes and photoelectric sensors from the laser damage.The laser protective mechanism based on the nonlinear effects of nonlinear absorption,nonlinear refraction,and nonlinear scattering is expounded as well as the laser protective mechanism based on the phase transition effect,and the respective advantage and limitations are analyzed.Future directions for the laser protective technology against intensity are pointed out.