Abstract: This paper reveals some results of experimental research on comprehensive utilization of agricultural wastes. The utilization is composed of three interrelated parts:1. Solidification, there are many different kinds of residues in agricultural production, such as rice hull, straw etc. , which can be extruded to make biomass briquetts under a particular condition. The influence of technological parameters such as working pressure, heating temperature and time of residence in the extruder is indicated and a rough range of parameters suggested.2. Charred technique of biomass briquette.Research showed that pyrolysis of biomass briquette produces five components: gas, liquid tar, solid tar,fixed carbon and ash. The mass ratio of pyrolysis products goes up or down as the heating temperature changes. The process and rules of operation are discussed.3. Recovery technique of pyrolysis products.The mixed gas from the charring furnace are processed by means of condenser, that is, a part of the gas changed into liquid condensate while another remain to be noncondensing gas. A good many of useful by-products may be obtained by processing the liquid condensate, while the noncondensing gas may be used as fuel. The technological' process of pyrolysis recovery and its application are given.