Two moot dolphin platforms with bucket foundations were installed in JZ9-3 field of the Bohai Sea in 1999. This also was the first time in China to use the multi-bucket foundation to the platform.Though bucket foundation platform has been installed before
there is no experience in pulling up process of the multi-bucket foundation platform after long time use. The reutilization of buckets is proved in the pulling up test. According to the results
the analysis about the pulling up forces is given; and the results have certain effects to guide the construction procedure and the further study about pulling up forces.