President Xi Jinping has prioritised advancing China's space programme to strengthen national security.
The Tianzhou-1 cargo resupply spacecraft made the automated docking process with the orbiting space lab after it had taken off on Thursday evening from the Wenchang Satellite Launch Centre in the southern island province of Hainan.
The Tiangong-2 space laboratory, or "Heavenly Palace 2", was home to two astronauts for a month last October in China's longest ever manned space mission.
Despite the advances in China's space programme for military, commercial and scientific purposes, China still lags behind the United States and Russia.
The U.S. Defense Department has highlighted China's increasing space capabilities, saying it was pursuing activities aimed at preventing other nations from using space-based assets in a crisis.
China insists it has only peaceful ambitions in space, but has tested anti-satellite missiles.
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