At times, document examination requires identification about intentional falsification into a document that was formed with inkjet printer to print its original version previously yet conduct added printing to engender the modified one afterwards. Such an identification involves with the techniques about how to authenticate both the printed document and the time to have the document formed. Rationally, it is necessary to analyze the document with its relatively stable and abnormal features so that the discrimination can be carried out between them, leading to a reliable identification. This paper dealt with an actual case of this kind. Through thorough analysis of the periodic occurrence of ink dot in the printed graphics and text, three abnormal features were found in the document, having resulted in a conclusion for their forming reasons based on the mechanism of inkjet printing. Therefore, the evidentially supporting proof was provided on whether the document was given birth from only one time or not.