Leaders from six countries along the Lancang-Mekong River convened in China's Sanya on Wednesday to discuss future cooperation.
China promises $1.54 billion in preferential loans and a credit line of $10 billion to support production capacity and infrastructure projects.
Lancang-Mekong cooperation is a new practice for South-South cooperation, Premier Li Keqiang said at the first Lancang-Mekong cooperation leaders' meeting in Sanya, Hainan province, on Wednesday.
Premier Li Keqiang paid his respects to the victims of the deadly bomb attacks in Brussels and expressed heartfelt condolences to their families, when attending the first Lancang-Mekong leaders' meeting on Wednesday, in Sanya, South China's Hainan province.
Premier Li Keqiang welcomed leaders from Thailand, Cambodia, Laos, Myanmar and Vietnam to the first Lancang-Mekong Cooperation (LMC) Leaders' Meeting in Sanya, and took "family photos" with them on Wednesday.
Security along Lancang-Mekong River has improved since China, Laos, Myanmar, Thailand established a law enforcement cooperation mechanism.
In 2011, two Chinese cargo ships refused to pay protection money to a drug-trafficking gang on the Mekong River.
The Lancang-Mekong Cooperation framework was proposed by Premier Li Keqiang in November 2014 during the 17th China-ASEAN leaders' meeting.
China called on countries along the Lancang-Mekong River to make the upcoming leaders' meeting fruitful for future cooperation.
A Cambodian official praised China on Tuesday for releasing water to drought-hit Mekong countries.
With the inaugural Lancang-Mekong Cooperation (LMC) leaders' meeting scheduled to open next week in China, Cambodia said the LMC is important for all Lancang-Mekong countries to maintain regional peace and stability and to boost economic development.
