Coincident with the people concerning the political issues is growing of the life level of the common people.  I think that the most essential quality of an effective leader is the ability to remain consistently committed to particular principles and objectives rather than yield to public opinion and abandon principle for the sake of compromise.     In some situations, it is more meaningful for the leaders to remain consistently committed to particular principles and objectives than yield to public opinion and abandon principle for the sake of compromise. When the leaders make the decision about the future of nation and make the national strategy战略 of long-term development, they should remain  consistently committed to particular principles objectives rather than yield to public opinion and abandon principle for the sake of compromise. Because most of the common people do not have the education of elite, the ability of critical thinking and the rich experience of the living in abroad, the public opinion is short-sighted and superficial. In 1946, the American ambassador to the Soviet Union sent a telegraph to the American president. In this famous telegraph, he elaborated assorted disadvantage of the Soviet Union and thought the United States were to win the victory of the competition. At that moment, the World War two was just finished and the United States is the ally of the Soviet Union. The precise judge of  the American ambassador to the Soviet Union towards the international context  results from his education of the elite and the rich experience 经历 in abroad. So he is called main designer of the Cold War and provides the base for that the United States won the Cold War. Many basic policy of nation made by the leaders are according to remain consistently committed to particular principles and objectives rather than be influenced by public opinion, such as the policy of restraining the population growing and the police of protecting the farm land of China.     In the course of becoming an effect leader, it is an important impact factor that he insists on the particular principles and objectives. Deng Xiaoping is a prime example of this. He remained consistently committed to reforming and opening policy from 1978 to 1997 when he had been away. Just because of the reforming and opening up, the economy of China really develops from then on. The problem, the divergence between the material and cultural need of rapid growing and out-dated ability of producing, is solved. And someone evaluates the reforming and opening up：“ It makes Chinese live a respectful life. "People have no reason to not support a leader like him and this leader has an effective force naturally.  Since many leaders in the world remain constantly committed to the particular principles and objectives, they become effective leaders, such as the Lincoln president of the United States.     In the history, there is the extraordinary leader who compromised the public opinion. Mao Zedong President of China is a good example of this. In 1950, Mao Zedong insisted to send Chinese army into Korea in spite of the opposition from many people. The reason of Mao Zedong's decision is simple: the benefits of sending army into Korea is great and disadvantage of not sending army into Korea is great. The result of sending army into Korea is the peace of 50 years of China. If China does not send army into Korea, the United States thinks China is still a weak country like Qing period that if any one sets several canon on the seashore of China, China will surrender just now. American scribes that the Korea war is a memory of crashing into 撞 the wall. It means that Americans are beaten hurt by Chinese and feel Chinese are not like sleep 绵羊 which are killed if they want. If China did not send army into the Korea, there will be not the memory of crashing into the wall and there will be also not the peace environment for 50 years. So the benefit of sending army into Korea is huge and disadvantage of not sending army into Korea is huge. Actually, many great leaders remain constantly committed to the particular principles and objectives, such as Lincoln insisting on canceling the slavery.     Although it has many advantages that leaders remain constantly committed to the particular principles and objectives, in some situations, it is more important that leaders yield to public opinion and abandon principle for the sake of compromise. For example, in the early time of the Unite States, the president did not set the slaves free in order to keep the nation complete. But I think that the most essential quality of an effective leader is the ability to remain consistently committed to particular principles and objectives rather than yield to public opinion and abandon principle for the sake of compromise.