In order to solve the difficulty in predicting the communication distance of ships that traveling in certain sea areas and based upon the analyzed results of Ultrashort Wave’s features, different types of ultrashort waves’ wireless communication models were established corresponding to different situations, including large-scale fading free space path loss model，log-distance path loss model, log-normal shadowing path loss model, as well as small-scale fading model’s Doppler principle effect. MATLAB was used to stimulate different situations and calculate different models ‘effect on radio station’s power path loss. Building on this base, methods of calculating link budget were brought up and methods of calculating the communication distances between ships‘ultrashort waves and airplanes’ radio stations were created. Strategies of deciding link budget were improved.