Architecture colour is an important part in urban designing. It directly affects the expressing and the thermal effect of
exterior surface of buildings. It has proved that four factors affect the sign visibility, graphics, colour, lighting condition
and age of the observers, and colour is the main aspect. The best method is to prevent the exterior space heating up in the
first place, by reflecting heat away room the exterior surface.The colour of paint to coat building's exterior wall can have
a huge impact on energy efficiency. While the suitable colour is essential to increasing the energy efficiency of paint
colour during the warm summer months, those products also help paint colour efficiency and reduce heat loss from
buildings during winter months making the interior more comfortable all year long. The article is based on analyzing the
importance of architecture color design and existing urban colour design. The effect of external surface colour on the
thermal behaviour of a building has been studied experimentally by Infrared Thermographic method in University of
Science and technology Beijing insummer.The experimental results showed that different colour has quietly different
thermal effect on the exterior surface of buildings. The thermal effect of carmine and fawn has nearly the same values.
The main factor which is color express, give some suggest ting about urban color design. The investigation reveals that
the use of suitable surface colour can dramatically reduce maximum the temperatures of the exterior wall.
Keywords: architectural colour, thermal, thermographic