Is it safe to marry a thalassemia minor patient?

It depends: If you have thalassemia minor (presumably you mean beta-thalassemia trait), then if your partner has the same trait, there is a 25% chance that any child that you have with the partner will have beta-thalassemia major, a severe transfusion-dependent condition.

Yes, but: Yes, but you should be tested to know your status if you plan to have children. The thalassemia minor won't hurt you at all. If your partner has thalassemia minor (i.e. Thalassemia trait), i would bet they are fine and have no issues. If you also have thalassemia trait, there is a chance you could have a baby with thalassemia (disease). You should see a genetic counselor.