Abstract: A golf club containing cylinder structure including a partitioning rack placed in a club containing cylinder is installed in a golf bag. The partitioning rack includes multiple elongated partitioning strips with different lengths and multiple connecting members interconnecting the partitioning strips to partition the club containing cylinder into multiple compartments. A club holding member and a club head retaining clip are located in each compartment for securely holding and retaining the clubs without collision, whereby the clubs can be separately smoothly placed in and taken out.