the biological clock can play a leading role in man’s physiological activities such as high-pressure, temperature ,purse, heart-beat , neuro-activity and hormone secretion ,so as to cause the high point and low point of the physiological activities . When in high point ,the emotion is always energetic and your work is efficient. On the contrary , your are depressed and easy to be annoyed and irritated while low efficient in your work and make mistakes all the time . Generally speaking , the noon and nightfall is the time when you are low and lose your temper easily ,so try to avoid such emotion .

The natural environment :
No matter sunny day or rainy day ,man’s emotion would affect directly by the index like  air-pressure, temperature, humidity and the clear degree .The cool rainy day in summer can calm down your emotion while the sultry rainy day causing by the high air pressure can lead you be in a bad mood. Besides , the beautiful scenery in the side of the hill or beach can be more proper to visit than the man-made magnificent palace ,for the former can make you feel relaxed.

The stimulus of the color :
The color can be give you a feeling of warm or cold. Like the red .orange and yellow are the warm color when purple, green and blue are the cold color. The bright color can help man get rid of the bad mood and feel better. Besides , the warm color can make you feel passionate and energetic while the cold color can give you the feeling of the calm and peace.

The life habit :
Smoking ,drinking and staying up can lead to the negative emotion while exercise regularly and appropriately can make you feel better.

The physiological period:
It is a common knowledge that woman can be unstable in emotion when she is during her physiological period .Therefore , it is very important to arrange your work and life scientifically and make you feel well in such period.