Using the joint catalogue, it is obtained through document delivery. You need to pay a certain fee to get the full text in this way. First, find the original collection through the joint catalogue (such as the joint catalogue of periodicals in the national medical college library), and then obtain the full text through the document delivery service. The Chinese Higher Education Document Guarantee System (CALIS) of the Ministry of Education, the interlibrary loan and document delivery service system of the National Science Digital Library (NSTL) of China Academy of Sciences, and the National Science and Technology Library of the Ministry of Science and Technology and its network service system of scientific and technological document resources all provide original text delivery services. The main delivery methods are e-mail and postal delivery.