According to the geometric properties of parabola, the distance from any point on the parabola to the focus is equal to the distance from the directrix. The combination of numbers and shapes is the simplest. If and only if point M is on the straight line y= 1 and point A is also on y= 1 and is the leftmost point of the circle, the minimum value of |MA|+|MF| is 4- 1.