The article deals with optical methods of measuring the parameters of two-phase aerodynamic flows using lasers. Methods of measuring the velocity and concentration of admixed particles on the basis of scattered laser radiation are described. Practical arrangements for a laser Doppler velocity measurement device and laser concentration measurement device are given. The problem of Doppler signal processing is examined in detail. The operation of a laser concentration measurement device in location of supersonic flows is described. Some experimental findings are presented.