@jun1wang - maybe yes and maybe no.
if he is a full time student under the age of 24 and he lived with you for at least 6 months of the year, you are probably okay to claim him as a dependent. Read @DoninGA s details of a "qualifying child'. He must check the 'I can be claimed by someone else' box on his tax return.
however, if your child was no longer in school, then he made too much to be claimed as a dependent. Once his income exceeds $4400 (I think that rises to $4700 in 2023), he is no longer eligible to be a dependent.
