This paper presents a passive dehumidifying solar houase(PDSH),with combination of the Trombe wall and the dehumidifying air layer.For the envelopment of PDSH a porous slab with salt soluiton is inserted into the air layer of Trombe wall.This slab can absorb moisture at inner side and release moisture at outer side.The PDSH wall can dehumidify the room during the outer air layer open in summer and have heatstoring during the outer air layer shut in winter.It is an important character for the Trombe wall.So,the PDSH wall can be applied to insulation and heatstore,or dehumidifying and cooling.Therefore,the PDSH wall can be adopted everywhere in the world.