Survivability is one of the most important promising technologies in Wavelength Division Multiplexing（WDM）networks.The P-cycle based dynamic multicast protection scheme（IpC）is widely accepted as a good solution due to its fast restoration time and high capacity efficiency.This paper presents an improved IpC mechanism named EIpC including both the segment IpC and the path IpC algorithm simultaneously.The main feature of EIpC is to use segment IpC algorithm to find a new P-cycle for a segment and path IpC algorithm to find a new P-cycle for a path

respectively.Theoretical analysis and simulation results show that the path IpC has better performance in resource utilization

the number of P-cycle（s）and the P-cycle’s average coverage

than the segment IpC and the classical（link）IpC.However

the link IpC has a higher average AE than the segment IpC and the path IpC.