Acquisition is one of the main functions to acquire library materials to the library in various ways in order to be collection development. Library materials include printed materials such as book and periodical, monograph, pamphlet, map, and non-printed materials such as palm-leaf manuscript, parabeik manuscript and other kinds of manuscripts, music score note, photograph, movie, film, disc, video and audio tape, records on paper and other medium and their reproductions.
The Library acquires its holdings through legal deposit, exchange with libraries in abroad, gifts, donation from private and organization, requisitions, and purchase. Materials are added to the collections of the Library at a rate of 3,000 volumes per year.

a)     Legal Deposit
The National Library has become a legal depository of Myanmar, since the Printers and Publishers Registrations Act promulgated in 1962.In 2014, it was changed to the Printing and Publishing Enterprise Law. A copy of any printed material must be given to the National Library according to the Law. However, government publications, reports of departments and organizations, publications that are excused by the above law and non-printed publications are not received by the National Library.
As the Depository Center for United Nations Publications, materials from United Nations Organizations such as UNESCO, FAO, ESCAP and others are available for reference and research purposes.

b)     Purchase
As the National Library is responsible to collect local publications to meet its vision, the library purchases local publications, publications on Myanmar from other countries, research papers, dissertations, gazetteers, reference books, etc. by its annual budget.

c)     Donation, Gifts and Exchange
By the exchange programme and gifts from oversea libraries and organizations, donation of private and organizations, the library has increased collection development. The Library also accepts the donation of specific donation of book collections and book lovers who want to keep their collections in single place, and maintain as Special Collection Corner. There are average 3,000 volumes of books and periodicals per year.