The invention discloses a method for sending a main notification message of an earthquake
tsunami warning system ETWS, which comprises that: a
base station sends a
paging message to a terminal in a current
system message modifying cycle after receiving the main notification message of the ETWS, wherein the
paging message carries a basic information part of the main notification message of the ETWS; and the
base station broadcasts the
system message containing a safety information part of the main notification message of the ETWS in a next
system message modifying cycle. The invention also discloses a method for receiving the main notification message of the ETWS, which comprises that: the terminal receives the
paging message, reads the basic information part of the main notification message of the ETWS carried by the paging message; and the
base station receives and reads the system message carrying the safety information part of the main notification message of the ETWS in the next system message modifying cycle, and verifies whether the basic information is true or not. The invention meets a
delay requirement on the main notification message of the ETWS reaching the terminal within 4 seconds by only modifying the base
station and the terminal slightly.