With the expansion of port handling capacity and economic benefit, large mountains highway traffic volume are aggregated to and transported by ports, and large increment of traffic volume of mountains highways connected with the port occurred. Based on studying characteristics of port transportation and mountainous highway traffic network, mountains highway traffic volume transferred by ports is analysed, and corresponding analysis model of passenger and goods volume of entering and leaving port is put forward. Firstly, choosing ports which mainly effect mountains highway volume; secondly, conllecting and studying category of goods, characteristic of passenger, throughput of passenger and goods, and development program of these ports in past years; thirdly, investigating goods category, throughput, space, and some other useful data of these ports at the present. Characteristics of waterway goods transportation is studied and spatial distribution of passenger, goods volume between different ports is estimated, and mountain highway traffic volume transferred by ports is forecasted. The method proposed in this paper is applied successfully in practical engineerings, and provides reference for engineering research.