A dual-screen ultrasonic diagnosis system (100) and an interface operation method therefor. The interface operation method comprises an interface projection step (11) and an interface recovery step (12). In the interface projection step (11), after an interface projection instruction is received, an interface projection relationship is established between a main screen (101) and a touch screen (102) of the dual-screen ultrasonic diagnosis system (100), a predetermined area that a user is interested in of the main screen (101) is projected onto the touch screen (102), and a projection interface corresponding to the area that the user is interested in is formed on the touch screen (102). In the interface recovery step (12), after an interface recovery instruction is received, the projection interface formed by projection can be removed from the touch screen (102), and the interface projection relationship established between the main screen (101) and the touch screen (102) can be cancelled. By means of the interface operation method, an operator can flexibly switch the displayed content on the touch screen (102) in the dual-screen ultrasonic diagnosis system (100), and the convenience, accuracy and operability of the touch screen (102) can be better used to improve the use friendliness for the users.La présente invention concerne un système (100) à double écran de diagnostic par ultrasons et un procédé de fonctionnement dinterface associé. Le procédé de fonctionnement dinterface comprend une étape (11) de projection dinterface et une étape (12) de récupération dinterface. Dans létape (11) de projection dinterface, après la réception dune instruction de projection dinterface, une relation de projection dinterface est établie entre un écran principal (101) et un écran tactile (102) du système (100) à double écran de diagnostic par ultrasons, une zone prédéfinie de lécran principal (101) qui intéresse un utilisateur est projetée sur lécran tactile (102), et une interface
