Russia's St. Petersburg Polytechnic University released news that the researchers found a new bioanalysis method, the use of laser spectroscopy signal measurement of liquid nano-and micron-size particles. With this, research results can be used in medical research liquid sample analysis, environmental monitoring and liquid technology testing and other fields. The new method has obvious superiority compared with the analytical methods currently used in practice. The new method of measurement of particle size in liquid is more accurate than traditional methods, and the accuracy of particle components in liquid can be increased by 20-60%. Previously, laser spectroscopy breakthroughs this limitation by scientists at St. Petersburg Polytechnic University, which limits the application of the technology by measuring only particles of the same size in liquids. In the study of the analysis of laser spectral information, based on the research of the Soviet Union mathematician and physicist Andrei Tikhonov, the Kikhonov regular method, the researchers at the university tried various methods and eventually found The new method for fast computation of nonlinear systems has dramatically increased the computational speed of particle size. This method ensures that the accuracy of the calculation is accurate enough, even in liquids that co-exist in multiple components. At present, the bioanalysis method has obtained relevant patents and the research team will introduce it into practical application as soon as possible.