The authors introduce the basic theory of dynamic light scattering(DLS).The basis components of experimental system are introduced,and the major things are the laser,PMT and digital correlation.They measure many particles that ranging between nanometer and micron.The factors are analyzed that influence the results,which are particles' dispersion and solubility,receiving area of PMT.They suppose some ways to obtain better result,and that is worth consulting for getting the correct result.
