In order to combine one dynamic grating (decoding piece) and one static grating (presswork) to produce Moiré fringe which can magnify the hidden information and realize information decoding, this paper analyzed the generation and amplification principle of the moiré phenomenon, determined the encryption parameters for single-information and two-way information hidden information based on features of printing screening, and output the encrypted samples with a printing press. As a result, the influences of different factors such as the dot shape, dot area, screen line number, dot angle on the hiding effect and decoding effect of the information were found out. In conclusion, the matching of encryption parameters for hidden information will achieve favorable decoding effect and will be widely applicable to anti-counterfeit images and printing conditions. Therefore it will provide technical support for the making of anti-counterfeit pressworks.