With the development of subject service in library,there have been many theoretical researches,but the practical effect is not satisfactory.Combined with the"double first-class"libraries construction environment,this article first sorts out the research literature on subject service of university libraries in China.Then,by using the method of network survey,it conducts a wide survey on the current situation of subject service of the first batch of new agricultural university libraries approved for the first-class discipline construction in China,and finds that the subject services of"double fi...