This paper presents a new solid composite adsorbent block after analyzing the influences of some factors on the heat transfer of adsorbent bed. The maximum variation of adsorbate content in a block bed increases about 50 percent compared with that of a grain bed of the same volume, and the thermal conductivity of the block bed is about three times of that of a grain bed by experimental studies. Therefor the performance of adsorbent bed composed of the blocks may have significant improvement compared to that of powder or grain bed. The effective thermal conductivity of the block is also discussed. The application of the solid composite adsorbent block in solar or waste heat powered adsorption refrigeration is discussed, and an solar cooling tube using the blocks as its adsorbent bed which may receive solar energy directly is presented.