Unlike subsequent official historical texts that adopted Confucian doctrine, proclaimed the divine rights of the emperors, and degraded any failed claimant to the throne, Sima Qian's more liberal and objective prose has been renowned and followed by poets and novelists. Most volumes of Liezhuan are vivid descriptions of events and persons. This has been attributed to the fact that the author critically used stories passed on from antiquity as part of his sources, balancing reliability and accuracy of the records. For instance, the material on Jing Ke's attempt at assassinating the first emperor of China was an eye-witness story passed on by the great-grandfather of his father's friend, who served as a low-ranking bureaucrat at court of Qin and happened to be attending the diplomatic ceremony for Jing Ke. It has been observed that the diplomatic Sima Qian has a way of accentuating the positive in his treatment of rulers in the Basic Annals, but slipping negative information into other chapters, and so his work must be read as a whole to obtain full information. There are also discrepancies of fact between various portions of the work, probably reflecting Sima Qian's use of different source texts; from these it appears that his great work did not receive a final editorial polish.参考资料:
http://en.wikipedia.org/wiki/Records_of_the_Grand_Historian