Pathology slides are one of the most important aspects of pathology. In the past, pathologists observed pathology slides to make a clear pathological diagnosis based on histological morphology. With the advancement of molecular diagnostic technology, a complete pathological diagnosis includes not only molecular diagnosis, but also genetic testing and subsequent targeted therapy, so pathological slides are a key step in pathological diagnosis. Pathologists can select the appropriate molecular diagnosis and do pathology slides for grading and classification through some special molecular tests. If necessary, genetic screening can also be performed to help patients with targeted drug therapy.