If you already have a masters degree with 3.50 GPA and apply for graduate school to get second which will they consider admission your undergraduate or GPA?

When applying for a second master's degree, graduate schools will primarily consider your graduate GPA, if you have one. Your undergraduate GPA will be considered, but it will likely hold less weight than your graduate GPA. They'll look at your overall academic record, but a strong performance in your first master's program will significantly influence their decision. A 3.50 GPA in your first master's is quite good and will be a positive factor in your application.