We know there is a command like this Example: AdvSkill Alchemy 100 that makes alchemy skill 100 yes we know that here is my question when I done that I am level upping very highter levels and that makes the game too harder is there any way to do this for alcemy or for other skill without level upping ? Sorry for bad english.

no, advskill alchemy 100 makes it go up by 100 times. It doesn't mean your skill is set to 100 it acts like you just made 100 potions. I have tested it out and had to do player.advskill destruction 5000 for it to even budge but it hadn't even raised a single level. If you don't want to level then type player.setav (skill) I think.

Thank you I will try that that is what I needed I think.

just remember that in some cases like Archery and speech you can't type those to have it work. Archery is marksman and speech is actually speechcraft if I remember correctly. Not sure why Bethesda did that...

player.advskill X 9999999999 will level the X to 100 so you can get to the max level of 81.
player.setav X 100 will change X to 100 but will not level you up.