Optical tweezers have been a valuable research tool since their invention in the 1980s.One of the most important developments in optical tweezers in recent years is the creation of two-dimensional arrays of optical traps.In this paper,a method based on interference is discussed to form gradient laser fields,which may cause the spatial modulation of particle concentration.The parameters related to the optical tweezers array are discussed in detail and simulated by the Matlab software to show the influence of important parameters on the distribution of particle concentration.The spatial redistribution of particles in a laser interference field can also be predicted according to the theoretical analysis.