研究了测度链上的二阶边值问题，解决了换元积分和格林函数对称形式构造中的困难，运用迭代技巧，得到了对称正解存在的充要条件，并举例验证了结果。%2-order boundary value problem on a time scale was discussed. The difficulty of substitution integra-tion and establishment of symmetric form about the Green’s function was overcome. A necessary and sufficient condition for the existence of symmetric positive solutions was obtained by using iterative technique. And exam-ples were given to illustrate our main result.
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