While deep foundations have been used extensively in clay to support both monotonic and cyclic lateral loading, significant uncertainties still now exist in predicting the field behaviour of such foundations, especially for the cyclic loading. Cyclic loads result of waves and winds forces on offshore structures or on bridge piers, mooring of boat on quays and variable overloads on many constructions and buildings. Useful data on cyclic loading of piles in sand have already been obtained from centrifuge model tests and the purpose of the present study is to provide new data on the response of piles in clay under lateral static and cyclic loads. The clay is a normally consolidated kaolin whose undrained shear strength increases with depth. Testing equipments and soil model preparation are presented in detail. The program of centrifuge tests is presented. Undrained tests on a rigid and flexible pile models (1/50) are performed. In the first test series, the ultimate static load was estimated. For cyclic loads, the pile top deflection was recorded using displacement transducer installed on the model rigid pile. The effect of the number of cycles on the head displacement was discussed.