He is the first Mongolian politician in history to relinquish his parliamentary privileges to take over an executive branch, working under the slogan “Towards the development of the new Ulaanbaatar City”.

Furthermore, he was elected as the Vice President of the Mongolian Freestyle Wrestling Federation and represented Mongolia at the Atlanta and Sydney Olympic Games.

In 2013 he nominated from the Mongolian People's Party (MPP) in the 26th parliamentary constituency and elected as a Member of Parliament and ended his business career.

Additionally, for the first time ever the MPP Steering Committee established the role of Secretary in Charge of the Capital City and appointed Sumiyabazar, which distinguishes his career from the rest.

During the 2016 Parliamentary election, in the 73rd constituency, Sumiyabazar ran for the MPP winning 52.5% of the vote and was re-elected as a Member of Parliament for the second time.

Subsequently, by the decision of the MPP Steering Committee, he resigned from his duties as a Member of Parliament on October 23, 2020, and was appointed as the Governor of the Capital City and Mayor of Ulaanbaatar.

In this context, the following activities have been implemented between 2016 and 2020, in which Sumiyabazar Dolgorsuren revealed his aim to develop the district region into a SMEs hub following large manufacturing plants.

A total of 1 billion 750 million MNT was invested in scholarships for 58 college students in the district to study in foreign and domestic universities including language courses.

Sumiyabazar Dolgorsuren was appointed as a Cabinet Member and Minister of Mining and Heavy Industry of Mongolia during the Parliamentary plenary session on October 19, 2017, with an 89.6% vote.

During his tenure as Minister, Sumiyabazar initiated the goal that “Mongolian citizens should be owners of their wealth” and thus in addition to implementing various major mining sector infrastructure projects, sourcing funding and organizing the transfer to state control, he was able to bring ownership to the 1072 shares of “Erdenes Tavantolgoi” JSC and reaffirm the decision to pay dividends which had been in discussion for nearly a decade.

He led the preparation completion of Tavantolgoi’s initial public offering on the international markets and the decision to pay dividends of MNT 96,480 for the 1072 shares.

Pension loans of up to MNT 6 million were written off for nearly 229,400 senior citizens through the issuance of securities which will be repaid with revenues from the Salkhit silver deposit.

The Ministry of Mining and Heavy Industry led the launch of the “Tavantolgoi Tulsh” LLC and the commissioning of the first refined fuel plant which was critical in significantly reducing Ulaanbaatar's air pollution.

The construction works related to the infrastructure of the oil refinery to be built in the Altanshiree soum of Dornogobi aimag which includes railways, roads and power transmission lines were completed in October 2019.

Based on the Erdenet Mining Corporation, a working group was formed to conduct research on the establishment of a mining-metallurgical-chemical industrial and technological park and a draft project proposal was created.