The compressive experimental produce is assigned to measure the compressive force, moving compressive length and their time consumption for the purpose of obtaining the quality and economical solid fuel briquette of rice and soybean straw. The two compressive processes are proposed in the analysis of the first compressive process. The results show that for the rice straw, the second compressive process is favorable for fabricating solid fuel briquette. While the hard soybean stems are intend to become the soft stems due to the presentation of broken stems under the high compresses in the first compressive process. The experiment reveals that the soft and hard stems of biomass feedstock shows the different properties which should be paid vital attention when design the pelletisers.