The invention discloses a map road annotating method of a navigation terminal. The map road annotating method comprises the following steps of: displaying map data to be displayed on a screen of the navigation terminal; dividing the screen of the navigation terminal; judging and determining road information needing to be displayed; detecting the road information needing to be displayed; determining the annotation density of road names; and annotating the road names according to road grades. According to the map road annotating method, aiming at the problems of the commonly used annotating method, a grid searching method is improved by considering the density distribution of the road annotations when road annotations are displayed, thereby the optimized display effect is realized.