Chinese leaders are concerned about the fate of the passengers aboard the missing Malaysia Airlines Flight MH370 all the time, and China will further intensify search efforts, a Chinese special envoy said on Thursday.

Zhang Yesui, also China's deputy foreign minister, told the relatives of some of the Chinese passengers that China has employed vast resources in the search, including 21 satellites, over 10 ships and dozens of plane sorties.

Zhang assured the relatives that China is doing its best to push Malaysia to coordinate international search efforts.

Chinese leaders, including President Xi Jinping and Premier Li Keqiang, have personally coordinated with other national leaders on the search efforts, he said.

"Our goal is to make every effort to find our missing countrymen. We will not give up as long as there is still a glimmer of hope," Zhang said.

China will continue to ask Malaysia to accurately inform the relatives of the passengers about the search and investigation progress in a timely manner, he said, adding the Chinese government will continue to provide help and service to the families.

The special envoy, who arrived here on Wednesday morning, was appointed by Xi to consult with the Malaysian side and deal with the matter of the missing flight.