Abstract: The coastal saline soil was studied through compaction test, unconfined compressive strength(UCS)test, indoor CBR test and water stability test in Haimen,Jiangsu. The influence of different modifiers on performance of coastal saline soil was analyzed such as cement or lime. The results showed that with the addition of 12%-14% cement or 10%-14% lime stone into the saline soil in mass, the UCS before and after immersion could reach the values required for the subbase of roads grade II.The best lime stone addition was 12%. The cement offered more improvement to CBR and more inhibition to saline soil expansion than the lime. The water stability coefficient ranged from 65% to 80% with the addition of 6% to 14% modifiers. In construction practice, the blocking and the drainage of water and other measures should be taken to reduce the influence of water on saline soil subgrade.