A planetary gear train of an automatic transmission for a vehicle provides at least ten forward speed stages and one reverse speed stage by combination of: first to fourth planetary gear sets respectively having first to third rotation elements, fourth to sixth rotation elements, seventh to ninth rotation elements, or tenth to twelfth rotation elements; first to eighth shafts; at least four clutches and two brakes. In particular, the first shaft is fixedly connected to the first and fourth rotation elements and selectively connected to a transmission housing, the second shaft is fixedly connected to the second rotation element and an input shaft, the third shaft is fixedly connected to the fifth, eighth and twelfth rotation elements, the fourth shaft is fixedly connected to the ninth and tenth rotation elements and selectively connected to the input shaft.