So it is necessary to establish a sound system to examine added or altered documents.

The identification of man- made ageing document, rubbed and scraped document, eliminated document, added and altered document and scraped together document can be used as different auxiliary tools in handwriting verification.

According to the three steps of determining the forged fact,analyzing the forging method and determining the original words which aref orged,the forged document made by printer printing method can be tested by comprehensively using transmitted light or side light observation,f luorescent inspection,comprehensive judges and other methods.