The interaction between the femtosecond solitons was numerically studied with source chirp under quintic nonlinear effect. The results show that under quintic nonlinear effect,when the source chirp is small,two solitons attract to collide and then repulse straight each other. With the increase of source chirp,more collisions happen. The farther increase of the source chirp leads to the split of solitons. The larger the source chirp,the more serious the split. In addition,the interactions between femtosecond solitons with source chirp are suppressed by unequal amplitude method to some extent.