With the spirit advocated in Four Books and based on the philosophical concept of practical knowledge of managing state affairs that is applicable in Ming dynasty,Li Erqing put forward the theory about the relation between Neo-Confucianism and economy,and practiced it by lecturing,by whi.

"Labor Contract Law" in the scope of application compared to the "Labor Law":firstly,it expands the scope of the main body of application,and secondly,that the atypical labor relations and factul labor relations that the scope of the regulation.

And then, the writer makes more deeply theory card on judge\'s authority of inquiry which include origination, connotation, function, system performance, specific application etc.

Throughout his lifetime he puts Confucian classics,known as teaching students in accordance with their aptitude into practice and he also puts forward his own teaching principle such as education is the basic condition of cultivating the talents and understanding the system to achieve use.