The line stretches from Kwasa Damansara to Putrajaya and runs through densely populated areas such as Sri Damansara, Kepong, Batu, Jalan Ipoh, Sentul, Kampung Baru, Jalan Tun Razak, KLCC, Tun Razak Exchange, Kuchai Lama, Seri Kembangan and Cyberjaya.

Following this, the line briefly parallels KTM and KLIA Transit (airport express) until Serdang Raya Selatan, and veers off to Universiti Putra Malaysia and the Seri Kembangan subdistrict.

The MRT line then enters Sepang constituency, having 3 stops including two in Cyberjaya, before ending at Putrajaya Sentral, where it interchanges with the KLIA Transit.

[8] The MRT2 project was initially planned to be between Kuala Lumpur and Port Klang, similar to Shah Alam Line's alignment.

[11] The project was official approved by the Federal government in March 2015 and allocated RM23 billion in the 2015 Budget[12][13] and construction was expected to begin by November 2015.

[14][15] However, construction was delayed due to adjustments to the alignment to extend the line to Putrajaya and to provide connectivity to the proposed High Speed Rail project.

[16] Construction officially begun in September 2016 with a groundbreaking ceremony at the site of the future Putrajaya Sentral MRT station by former Prime Minister Dato' Seri Najib Tun Razak.

[17][18] On 10 October 2017 at around 5pm, an explosion occurred at the Mass Rapid Transit (MRT) station construction site in Bandar Malaysia.

[26][27] By 3 April 2021, The Construction progress of Phase One section of the MRT Putrajaya Line (Kwasa Damansara – Kampung Batu) is at 97% and was planned to begin operations in August 2021.

[28] However, this was postponed multiple times due to the COVID-19 movement control order in Malaysia[29] and that the line requires furthering testing.

Because the tests could take longer than usual to pass, the opening date of Phase 2 was expected in March 2023, delayed two months from the original January 2023 deadline.

[32] Phase 2 of the MRT Putrajaya Line was officially launched by Prime Minister Anwar Ibrahim at the Serdang Depot on 16 March 2023 at 3pm.

The proposed designs range from preserving the rustic, reflecting tidal rhythm, promoting well-being, vibrancy, pulse of life, discovering culture, molding forms, inspired by nature to streamlined flow.

[36] 28 (23 elevated + 1 half-sunken + 4 underground) out of 35 stations (excluding the ones on the MRT Kajang Line) are expected to have feeder bus services.

The rolling stock is provided by HAP Consortium which consists of Hyundai Rotem, Apex Communications and POSCO Engineering.

[39] The 4-car trainsets are maintained at 2 purpose-built facilities, Sungai Buloh and Serdang depots, located nearby Kwasa Damansara and the proposed Taman Universiti stations respectively.