A new type of mode-locking laser-non cavity length matched additive pulse mode-locking laser was realized experimentally. This new kind of laser consists of an active mode-locking Nd:YAG laser and a nonlinear antiresonant ring as an end mirror. A semiconductor doped glass was used in the nonlinear resonant ring as a nonlinear element in which the nonlinear phase shift was produced when the mode-locked light pulse propagate through it. In proper conditions stable mode locking performance was got with a pulse width of 60 ps which is more than three times shorter than that from a normal active mode-locking Nd:YAG laser. The Inode-locking characteristics of this laser are presented in this paper.