How can I create a default template for Calc?

why calc can’t save user-defined format, when we add some format to cell, it always gone when i open new workbook or new calc document.

sorry my bad english

Please, what is your Operating System and LibreOffice version?
Do you use the native format .ods to save?

im use win xp, and LO 3.6.4, yes i do

Take a look to this thread, it is about writer default template, but it is the same for calc.

Calc saves all user-defined formats in the actual file NOT in the program. You can define all your formats and save the workbook as a template .ots. Next time you need a new document, open the template, modify it and use save as for saving it as an .ods file.