The method of putting nine balloons into hearts is as follows: 1. First, draw a heart-shaped outline on the ground with chalk or lines.

2. Place 8 balloons on the ground according to the heart-shaped outline to form a neat circle.

3. Place the last balloon at the center of the circle and connect it with other balloons to form a complete heart shape.

4. Add some decorations on the balloon as needed, such as ribbons and bows. Let the heart be more beautiful.