A screen broadcasting method

The screen broadcasting method includes: A. for the sending end to acquire screen image and blocking all the acquired image frames in the same regulation; B. to compare all the blocks of the current frame with those of the last frame in the corresponding positions to find out the varied image blocks; C. for the sending end to code the varied image blocks and to send the varied image blocks together with their position information in the screen; and D. for the receiving end to decode the blocks and replace them for those in current screen based on the corresponding position information. The present invention makes the screen broadcasting in video meeting system has less resource occupation, low code rate and high in image quality.