Laser light scattering method introduced in this paper is a new method to study macromolecular gelation.The most prominent features of the methods are its high sensitivity and use of the scanning technique, whereupon the parameters describing the properties of reaction process at a macro level can be obtained. They are the speed and the point of gelation and the point of phase separation. The parameters describing the inhomogeneous changes in reaction systems at a sub-micro level can also be obtained. They include a (the correlation coefficient) and (the mean squared dilectric constant fluctuation). Thus, the tracks describing the inhomogeneous changes in reaction systems can be traced. The method presented here will provide a new approach to decpening understanding of the gelation process. Laser light scattering method introduced in this paper is a new method to study macromolecular gelation. The most prominent features of the methods are its high sensitivity and use of the scanning technique, whereupon the parameters describing the properties of reaction process at a macro level can be They are the speed and the point of gelation and the point of phase separation. The parameters describing the inhomogeneous changes in reaction systems at a sub-micro level can also be obtained. They include a (the correlation coefficient) and (the mean Thus, the tracks describing the inhomogeneous changes in reaction systems can be traced. The method presented here will provide a new approach to decpening understanding of the gelation process.