The use of 2,2-bis(ethyl ferrocenyl) propane (BEFP) burning rate catalyst with the commercial name catocene is one of the most common methods to increase the burning rate of solid composite propellant. Despite the benefits of increasing the burning rate, the migration of this compound from propellant to the interface areas can lead to change the internal ballistics of motor, weakening of interface adhesion, liner separation and improper operation of the motor. In this article, migration of catocene was investigated using Soxhlet solvent extraction method for16 hours and quantitative analysis by UV-Vis spectroscopy. Based on this, the migration was investigated in three areas of a propellant containing 3% of catocene in a period of 30 days. Also, the efficiency of two liners with high filler content (HFL) and high cross-linking content (HCL) against catocene migration was compared. The obtained results showed that the migration started during propellant curing and continued at least 30 days after the completion of curing, in the conditions of accelerated aging in 50 ℃. So that the mean percentage of catocene in the propellant of both HFL and HCL samples .