Digital light processing (DLP) is widely used in tissue engineering in recent years. High resolution and high speed are the advantages of this printing method. The method of determining DLP process printing conditions by forming experiments is restricted by the formability of the material and it is difficult to apply to soft materials and materials that are not easily formed. In this study, through theoretical analysis that the concept of absorbances and gel point is introduced into the relationship between exposure time and forming thickness. This allows the forming conditions to be obtained by measurement of only physical quantities related to the nature of the material itself rather than through forming experiments. Which facilitates high-precision DLP printing of biomaterials.