A new improved thinning algorithm is proposed in the paper. In the new algorithm

we advance a series of combination-templates which reinforce the speed of templates matching

and then optimize the combination templates. Finally based on the optimized templates

we bring forward the new algorithm. After doing lots of experiments

we find that the new algorithm plays a good performance in thinning quality

and at the same time

its thinning speed is 3 to 6 times faster than others

so it is a better thinning algorithm.