Dear Alrafee,
I really don't use Aroon indicator and not into much of it.
Basically I know it is used to detect the trend and to weight the strength of a trend.
Though I hope what I gathered here would answer your questions I hope.
"When Aroon(up) and Aroon(down) are moving together, there is no clear trend (the price is moving sideways, or about to move sideways).
When the Aroon(up) is below 50, it is an indication that the uptrend is losing its momentum, while when the Aroon(down) is below 50, it is an indication that the downtrend is losing its momentum.
When the Aroon(up) or Aroon(down) are above 70, it indicate a strong trend in the same direction, while when the value is below 30, it indicates a trend coming in an opposite direction.
Finally, for the Aroon Oscillator, the positive value indicates an upward trend (or coming trend), and the negative value indicates a downward trend. The higher the absolute value of an oscillator, the stronger is an indication of a trend."