Abstract: A placement algorithm guided by the dynamic topology of clock network is proposed for clock network optimization.During placement the clock topology is built by way of the top-down partitioning and the bottom-up clustering,moreover,it can be adjusted according to the distribution of the clock sinks;the pseudo nets are added to the bottom clusters in order to guide the distribution of the clock sinks,the clusters and pseudo nets can also be adjusted according to the distribution of the clock sinks.The experimental results show that,the clock network is greatly improved in length and power.