Taken into account second and third order dispersion in the region of anomalous dispersion,an analytic expression of the dispersion induced chirp is obtained.The evolution of the second and third order dispersioninduced chirp in anomalous dispersion is investigated.using numerical method,we simulate the evolution of chirp near the zero dispersion point when the dispersion interacts with nonlinear effect.Third order dispersion induced distortion of the edge of the pulse can be found through the result.