No immediate casualties were reported. The fire broke out somewhere around the 35th floor of the 75-storey skyscraper, local media said, Xinhua news agency reported.
Hundreds of tenants left the building, some of them coughing from smoke inhalation.
Light wind and a clear sky amid temperatures around 40 degrees Celsius aided the flames which rose quickly upward from level to level.
One Arab tenant of the 285-metre-tall building who managed to take out his most valuable belongings in a hand luggage-sized suitcase told Xinhua the building was quickly evacuated when the fire alarm went off.
Dubai Police sealed off the surroundings of the tower in a radius of around 300 metres and urged drivers coming from nearby to take alternative roads as space was made for fire brigades and ambulance vehicles.
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