本文针对对称的静定结构，提出了一种新方法---对称法。取用了该种结构“半结构图“，并进行了证明，巧妙利用对称法对结构进行内力计算，是一种教学内容与方法的创新，填补了现行教材静定结构“对称法”的证明与对称性利用的空白，大大降低了解题难度，加快了计算速度，提高了计算效率，提升了学生兴趣。%According to the static structure of symmetry, this pa-per puts forward a new method-symmetric method. Taking the"semi-structure", and it is proved by calculation of internal force of structure. This method of calculating the internal forces by us-ing the symmetry method is an innovation of teaching contents and methods, and it not only fills with the current textbooks about static structure "symmetry" proof and application, reduces the difficulty greatly, speeds up the speed of computation, improves the computational efficiency, but also enhances the students' in-terest.
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