回复：请指点如何renew child support

Salary increase per se is not a valid reason to ask for more child support. Typically, you would have to show that there is a signicant change in circumstances that warrants a modification. For example, relocation, changing jobs, etc.

To modify child support, you would have to file a motion to the court that granted the child support. You can do it yourself but would be wise to get an attorney's help.