Abstract:Satellite navigation message is an indispensable element for satellite navigation system functioning normally and precisely. The design a nd evaluation of the message is critical for constructing a satel lite navigation system. The development history and performance discrepancy regarding extant differen t GNSS are analyzed in message content, message structure, and message broadcas t way. In addition, the technical problems of design and evaluation in current navig ation message are proposed. Furthermore, the relevant technologies a nd trends are predicted and prospected.