With the rising of outdoor activities and extensive using of Blue Tooth technology, compact portable speaker is getting more and more popular in recent years, most audio brands are involved in the competition.However, the sound quality varies greatly, especially in bass performance.In order to ensure the play time of battery, the lower consumption of electrical power is expected ideally.In the systematic point of view, the key of portable speaker design is to develop a passive speaker with higher sensitivity or acoustic output (SPL, covering the full range).The topics in this paper mainly include the matching between driver size and cabinet size, bass type choice (sealed, droned or ported), the compromise and optimization among driver T/S parameters, etc.