it means someone has formed his own style of doing something by praticing it for a very long time. the chinese explanation is 形成自己独特的风格. can be explained as a particular form or style that is well recognized by others. here is a online idiom dictionary for you: http://chengyu.eduu.com/detail/3105.html hope it can help:)

有他自己的风格，和别人不一样，很独特。英语试试不知道准不准确，就是 has his own style。例如 Van Gogh's painting has his own style。

形成了自己的独特的风格。

比喻这个人的书法很有特色，不主流，不大众，很有自己的风格。也可以说：自成一派、独具一格、独树一帜等。

在某种学问或技艺上有独特的见解或独特的做法，能自成体系。