Thanks NitroLiq I know this tutorial. But I think that my problem is another. Circular fillet is for surfaces which is intersec.isn´t it? I wanted to use blend fillet. Conecting fillet to existing trimmed lines on surface. But when I choose it,surface was horrible. Some of little peaces trimed lines has changing reverse( i think becouse there was strip of fillet reverse, on the side where is that little peaces trimmed edge). But how I could change it when on trimed roundfillet objest is 3 disconected trimed edges peaces and they are something like isoparms and they can´t change reverse. I don´t understad it. Thanks....