Since it down to the Cloud Grand Canyon and opposite to the cliff, the sound could return from the bottom of the canyon and the cliff, forming echo phenomenon continuously.  This echo wall is total natural, no other man-made echo wall could receive such amazing effect like it.

     Huangshan is beautiful all year round. In spring (March to May), all flowers blossom, pines turn green and the birds sing beautifully. Summer (June-August) is the best time to appreciate the pines and prevent sunstroke. In autumn (September to November), tourists can see the pines, rocks, maples and chrysanthemum. In winter tourists could admire the snow and the rimed trees. When the weather is fine, you could view the grotesque rocks, when it is cloudy, you can appreciate the changing clouds, when it rains, you could see the springs and waterfalls, when it snows, you could see the crystal tree and Rimed tree, when it is windy, you could listen to the sound made by the swinging pines. You could be satisfied in any kind of weather.