It was part of the government's campaign on the International Day Against Drug Abuse and Illicit Trafficking, which falls on June 26 every year.
The first criminal, 39-year-old Cai Liqun, was found guilty of selling methamphetamine and magu. The latter is a mixture of methamphetamine and caffeine, and is a relatively new type of drug in China. Cai bought the drugs by post before selling them on multiple occasions between September and November in 2015, said the court.
The other criminal, 36-year-old Huang Zhengye, was found guilty of transporting and selling methamphetamine.
He was caught in possession of 4,749.8 grams (10.47 pounds) of methamphetamine and 71,100 yuan (£8,143) in relation to drug dealing in September 2015, according to the court.
The death sentences and the orders of the execution had been made by the Supreme People's Court, according to Haikou Intermediate People's Court.
'Now I announce, take Cai Liqun and Huang Zhenye to the execution ground and carry out the execution by shooting,' announced a female judge on the sports ground.
The two courts also gave first trials to 17 other drug dealers involving in eight different cases during the same event.
Among them, eight of them were given death sentences or death sentences with reprieve, according to chinacourt.org, citing China News.
It's not uncommon for a Chinese court to give death sentences to criminals in front of a large crowd - sometimes as many as thousands of people.
The authority aims to use the form to warn the public against committing crimes, especially drug trafficking.
Verdicts and sentences for the criminals are normally made beforehand, and the judge would simply announce them to the masses.
Spectators at yesterday's event appeared to support public death sentencing.
Pan Hui, a teacher from the local Yunlong Middle School, told China News that such events could help 'educate' and 'frighten' the students, and they could also make the students fearful of committing crimes.
'Our school has been carrying out anti-drug educational campaigns constantly to keep the students away from drugs,' said teacher Pan.
However, concerns have been expressed in the past towards China's public death sentencing.
Last December, the Chinese media called a similar rally in southern Chinese city Lufeng 'inhumane' and 'insulting'.
A columnist, named Shen Bin, called for an immediate end on such rallies.
Shen said though the local authority's purpose was to scare the local suspects and boost sense of social security, they shouldn't break humanity's bottom line which was protected by the law.
Shen argued that China's Public Security Bureau issued a regulation in 1988, which prohibited courts from publicly shaming criminals.
Commenting on a different rally in Shanwei city in last June, William Nee at the Amnesty International said the event was 'tragic' and 'barbaric'.
