The optical transmission network is often involved in the problems of network nodes.After selecting the source and sink

the network should also designate the central site

which will establish a shortest path for business requirement.In this paper

we propose a new algorithm based on improved genetic algorithm.The algorithm generates a random tree based on the nodes.In the random spanning tree

we choose two nodes among the selected nodes.The sub-path of the node and the selection probability of the sub-path are used to dynamically adjust the crossover and mutation of the adaptive mechanism to improve the search efficiency.Therefore

the genetic algorithm is improved which can be applied to solve the necessary network node problem.Finally

the simulation results show that the proposed algorithm can meet the application.