Abstract: On the analysis of characteristics of the CTS and fishbone, and based on the situation that traditional fishbone prone to destroy the logical structure of original design, thus reserve the structure of 2 levers ICGs at least, bulid fishbone at specific points in clock network.According to the design requirements, there are two different new means of fishbone clock network combination with CTS.Under the same conditions, the clock delay in fishbone built on clock network points is less 47% than CTS, power consumption also reduce by 16%, and function verification is more stable than traditional fishbone.