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Brazil, Russia and India all sent condolences to the quake-hit zones in Qinghai province.
Russian President Dmitry Medvedev and Prime Minister Vladimir Putin Wednesday extended deep condolences to Hu over victims of the devastating quake while pledging assistance in dealing with the aftermath.
Brazilian President Luiz Inacio Lula da Silva expressed deep condolences to Hu over the tragedy during their meeting.
Indian Prime Minister Manmohan Singh sent a special messenger with a letter of condolences to the Chinese delegation in Brasilia.
During their meeting on the sidelines of the BRIC summit, Singh said the Indian people were sorry to hear about the devastating earthquake and expressed deep condolences to China.
In order to inform the Venezuelan and Chilean sides of the situation, Hu held telephone talks with Chilean President Sebastian Pinera late Wednesday night and called Venezuelan President Hugo Chavez at midnight.
Hu told Pinera and Chavez he had to postpone visits to their countries due to the quake in northwestern China.
Pinera said he fully understood and backed up Hu's decision to return home earlier, and expressed condolences and sympathy for the heavy casualties on behalf of his government and people.
Chavez said he fully understood Hu's decision to postpone his visit to Venezuela, and also sent his condolences and sympathy. He said Venezuela would like to offer all necesary assistance to the quake-torn areas.
On Thursday, the last day of his visit, Hu attended as many as 10 bilateral or multilateral activities, during which he talked about the Qinghai earthquake frequently and closely followed the latest updates on the disaster relief work.
From the distant land of South America, President Hu's heart went out to his countrymen, who were fighting the disaster.
On Thursday night, Hu embarked on his plane and began a 25-hour flight back home.