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It seems all the two do just one thing:

breakthrough the works that we must do in our project.

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    Hi, welcome to Project Management Stack Exchange, the site for expert and enthusiast PM's. Have you tried Googling this? What have you learned about it so far? What research have you already done on your own? Can you include more detail in your question or more specifics to help you get the best possible answer? As it stands, your question is extremely vague, and it's not very clear what you're looking for. Please see the FAQ for guidelines on how to ask great questions. – jmort253 Mar 3 '12 at 8:59
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The WBS breaks down what you are building for the project into smaller, more manageable components. In most cases, the WBS should be things, not actions. The leaf level, the lowest decoposition of the WBS, is your work package. The work package, and the activities and resources--both human and materiel--are scheduled for deployment. You can include the entire WBS in the schedule or start with the work packages as your level one.

Once scheduled, the Gantt chart is a visual view of the schedule, which can be summarized to show a higher level schedule for executive review or decomposed to lower levels for a more tactical analysis.

The WBS shows what you are doing and the Gantt chart shows when you are doing it. You would use the WBS for scope control, including change management, and you would use the Gantt chart for schedule control.

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The WBS is a time independent decomposition of the work requires to compete a project. After you assign owners and sequence the tasks, one output is the Gantt chart. The Gamnt is uaully at a much higher level.

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