Pile foundation is widely used in platform foundation. The reliability design method has been adopted worldwide. When it was introduced into China

it is pointed out that designers could refer to the standard (Recommended practice for planning

designing and constructing fixed offshore platforms-load and resistance factor desing ) when the environment conditions and the design method were coincided with those in China. Otherwise

difference criterion and data should be taken according to the specified environment conditions in China. As a result

more attentions should be paid on studying the foundation design method of offshore structures. In this paper

a database management system has been established

in order to manage and analyze the data of the geotechnical properties of foundation soils. This database includes almost all the borehole logs and properties of the soils of SZ36-1 Oil Field. Based on the database

the stationarity and ergodicity of a soil profile in SZ36-1 Oil Field have been examined and a random field modeling has been established. The correlation function

correlation distance and variation reduction function of SZ36-1 Oil Field have been simulated. A calculating model for pile foundations has been established

on the basis of the established database and design experiences. As an example

reliability analysis for a pile foundation has been performed. The influence of variations of soil properties and loads on the reliability index has been analyzed

and the calculated partial factors compared with those recommended by the API (American petroleum instituted) Criterion.