The invention provides an image transmission method which comprises the following steps: A, a source terminal divides images to be sent into a main part and at least one secondary part; B, the source terminal sends the main part of the images and different secondary parts correspondingly to different target terminal screen characteristic parameters to different target terminals according to characteristic parameters of different target terminal screens; C, the target terminals display the main part and the corresponding secondary parts of the received images in a combined manner. The invention further provides an image transmission system correspondingly. Through the image transmission system provided by the invention, images are divided into five parts including a left part, a right part, an upper part, a middle part and a lower part, different parts are required to be sent according to different receiving parts, and data transmission quantity is reduced; and sending parts send selectively according to IP addresses of different receiving parts and properties, and the receiving parts only receive self required parts for combination through IP address matching, so as to enable the receiving parts to reduce decoding data.