Wu Jing is a famous historian in Tang Dynasty. Because Wu Jing is in the Tang Xuanzong Kaiyuan, Tianbao Tang Dynasty prosperous and decline in the transition period. Wu Jing sensed the change of Tang Dynasty society and hoped to compile a history book to alert Tang Xuanzong. Wu Jing took this as the starting point, wrote "Zhenguan dignitaries ". Wu Jing hopes that Tang Xuanzong can learn from Tang Taizong's ruling thought and cultivate politics.