Abstract: The different solutions of elements＇ relations in one-dimensional transmission matrix are discussed. Firstly,if V （x） = V （ - x） is considered, the general method is introduced to find out the relations among elements in transmission matrix. Secondly, we especially discussed how to use the symmetry of wave func- tion to solve the same question. As a result, the later method is more simple and succinct. It also can help us to understand the whole physical process. If the similar situations are confronted, the second method can be used to work out the question. It is more helpful than the others.

Key words: transmission matrix, parity, symmetry