Developping Nancay Radioheliograph

This paper reviews the construction and development of the Nancay Radiolieliograph in France.Starixcl from tlie need of astronomical topic,it was often renewed and developped during thirty years and more and it has been following in a hurry the tracks of astronomical technique,electronic technique-and computer's technique.In SMY of Cycle 21,the observations and researches have been attaining the advanced world level and pushing forward the developinent of solar radio astronomy in France.