The invention provides a transmission method and system of pictures. The transmission method comprises the following steps: selecting pictures; setting a password group, wherein the password group at least comprises the biological characteristic information of a user; encrypting the selected pictures through the password group, so as to form encrypted pictures; setting the attribute of the encrypted pictures to be not transmittable, and setting the attribute to be invisible or not optional when a user accesses the transmission interface. According to the transmission method and system of pictures, the transmission options of pictures are added, so that the pictures can be displayed while being not transmitted, and the privacy of the user is protected while the pleasure of the user for sharing pictures for enjoy is met; the advantages of high pertinency and safety are achieved.