Hi Bubu,
Spacing feature is not supported in the currently available version 3.3.0.0. If it is the spacing between the bars in the ChartWebControl you are referring to, using the PrimaryXAxis.Range property you will be able to control the horizontal layout of the ChartWebControl.
Please take a look at the sample attached which illustrates this. Let me know if this fulfills your requirement.
Thanks for your interest in Syncfusion products.
Regards,
F.Rashidha
Project1.zip