这个是基于环形拓扑结构的约束微粒群算法，对原来的算法做了改进，只用到了一个邻居节点，效果与基本的微粒群算法大致相当。但是在对多模函数的计算上，优于基本的微粒群算法。这个算法的运行平台是GPUmat,需要的运行环境有：Matlab, GPU, GPUmat, Visual Studio.-This the modified particle swarm optimization algorithm that based on ring toplopy with constrain condition. The lbest of this algorithm only comes　itself and its one neighbourhood , the experimental result show its performance as well as simple PSO. However, it is better than simple PSO when it is applied in the multimodal function. The systme environment including: Matlab, GPU, GPUmat, Visual Studio.