We present a colliding pulse passively mode-looking Nd: YAP(Nd: YAlO3) laser using an unstable plano-convex resonator configuration with an antiresonant rineg Using this system, we have obtained a perfect mode-locking pulse train. At 1Hz repetition rate, shorter than 10ps average pulsewidth and up to 80mJ output energy of thepulse train are obtained. There are three higher pulses in the centre of the pulse train. The reproducibility of mode-looking pulse train and the stabilityo output energy are excellent.