But if Yang Peiyi was the best, why was she not on camera? A photo of Yang posted Tuesday on popular Web site Sina.com shows a smiling girl with bangs and crooked teeth.
In his interview, Chen claimed that the last minute change-up was a "sad decision that we did not want to make."
In fact, the change happened at such a late notice that Chen said, "The voice that Lin Miaoke heard was actually Yang Peiyi's sound, but she herself may not have realized this."
"We've heard Lin Miaoke's recording," Chen said as he shook his head. "It was played live at a rehearsal. There were many different departments, especially leaders from the Politburo [the Central Communist Party leadership] who all gave us their opinions that it must change. So, we had no choice."
Chen believed that replacing Lin's voice with Yang's was fulfilling an obligation to society. "We have a responsibility to face the Chinese audience," Chen said.
"I think all of the listeners and audience should also understand this situation. This is for the benefit of the country, the national culture. This is the face, the image of the national music culture. Especially the entrance of our national flag, this is an extremely important, extremely serious matter."
"I think this situation is fair for Lin Miaoke and Yang Peiyi, it's fair for both of them. This is to say, [we] have the best image, and the best sound and we combined the two.
Chinese bloggers generally accepted the lip synching and some even approved of it.
"Why was the original girl not on stage? Because she was having dental work done," justified a blogger on Sina.com.
Another blogger wrote, "Fake singing is not good but for the image and interests of the country, fake singing now and again is acceptable."
"On a sidenote, we should recognize that lip synching is in fact a form of art," the same blogger said sarcastically, in an attempt to provoke others.
Others found nothing wrong with the lip-synching.
"Lip synching has been happening for decades. Putting on the best performance we can is the most important. Plus two girls, not just one, got a chance to be famous. Their futures are very bright."
The Associated Press and ABC News' Cao Jun contributed to this story.