Abstract: By using the corn straw,straw and rape produced in Sichuan as raw materials,studies were made of the molding density influence factors of the water content and the type of the straw.It was found that when the water content of raw materials was 18%~22%,the molding effect was the best,and the molding density was close to or greater than 1.05 g·cm^-3.The ratio of straw:corn straw:rape straw was 2:2:1,and the molding effect was good,and not easy to plug the forming machine.After 2 weeks at the room temperature,the transformation of the molding straw was small.