张孝忠，出身东北两蕃部族，其父张谧在开元年间率部内附，此后其家族在发展过程中经历民族融合与政治变迁，逐渐华化。张孝忠家族的华化历程，呈现出两条各具特色的发展脉络。其一为定居地区的变化，从化外之地迁居幽州，再从幽州迁往易定，最终定居长安。其二为家族发展的转型，从追随安史的叛军将领家族，到河朔地区效忠唐廷的藩镇节度使家族，最终成为联姻天子的京师官宦世家。这两条脉络随着张孝忠家族的华化而并行发展，在家族华化的不同时期，分别呈现出明显的变化。

张孝忠家族从幽州迁往易定，最终内迁长安的过程中，对唐王朝认同感有着明显的增强。这种增强主要表现为从追随安史父子对抗唐廷，到效忠唐廷，拒绝跟从叛乱，再到积极协助唐廷平定叛乱，最终成为河朔地区首个举族入朝的节度使家族。张氏家族在迁移过程中，对唐王朝认同感的增强，实质上反映出自安史之乱后到宪宗时期，唐廷在河朔地区的影响力在逐渐恢复。

在内附唐朝之后，张孝忠家族的族源叙事经历了从“其先燕人”到“夏后氏之胤”再到“轩辕之胤”的递进变化。主要分为两个时期，第一个时期为张孝忠父子时期，张氏父子的墓志中均称其祖先为“燕人”，初步构建起具有华夏色彩的族源叙事。第二个时期为张氏家族后人时期，在张孝忠之孙张达墓志中将祖先最终确定为“轩辕之胤嗣”，并且将郡望定为张孝忠发迹之地上谷郡。张氏家族族源叙事中黄帝后裔身份的构建，是唐代民族文化融合的一种体现。张氏家族表现出家族内迁、塑造郡望、儒家文化影响加深等当时民族融合的普遍特征，同时也在久得汉姓、明确黄帝后裔身份、主动迁入长安等方面，展现出其家族的民族融合的特殊表现。

张孝忠家族定居河朔时期，河朔形势变化与家族发展转型存在着密切关系。代宗时期，安史之乱平息，安史部将依靠自身实力割据河朔，张孝忠成为成德节度使李宝臣的部下，其家族发展深受李宝臣影响，并且交好河朔藩镇的重要成员。在德宗削藩的建中之乱期间，唐廷在河朔地区的影响力有所恢复，张孝忠拒绝跟从叛乱，转向效忠唐廷，在唐廷扶持下成为义武军节度使。宪宗时期，唐廷在与藩镇力量的对比逐渐占据上风，张茂昭则成为首开举族入朝之风的河朔节帅。可见，张氏家族在河朔地区的发展转型，是其家族根据不同阶段河朔形势变化所做出的应对。这一发展转型，呈现出安史之乱后到宪宗时期，河朔形势发展变化的部分线索。首先是唐廷在与河朔藩镇的力量对比中逐渐占据上风。其次是河朔藩镇之间较为稳固的联盟关系逐渐被打破。最后是河朔藩镇内部关系有着持久的影响。

ZhangXiaozhong was born in the tribes of Northeast China. His father ZhangMi was affiliated to his family during the Kaiyuan period.After that,his family experienced ethnic integration and political changes in the development process,and gradually became Chinese.The process of ZhangXiaozhong family’s Chinese culture present two distinctive development lines.The first is the change of settlement area. He moved to Youzhou from outside Tang’s region,then from Youzhou to Yiding,and finally settled in Chang’an.The second is the transformation of the family development,from the rebel generals who followed the AnLushan to the vassal clan who were loyal to the Tang Court in Heshuo region,and finally to the official family who married the emperor in Chang’an.These two veins developed in parallel with the Chinese development of ZhangXiaozhong's family,and showed obvious changes in different periods of the family’s Chinese development.

When ZhangXiaozhong’s family moved from Youzhou to Yiding and finally to Chang 'an,their sense of identity of the Tang Dynasty was significantly enhanced. This enhancement was mainly manifested as following the Anlushan and Shisiming  and their sons to fight against Tang’s court,to be loyal to Tang’s court,refusing to follow the rebellion,to actively assisting Tang’s court to quell the rebellion,and finally becoming the first chief officer family in Heshuo area to bring the family into the court.In the process of migration,the strengthening of the sense of identity of the ZhangXiaozhong’s family to the Tang Dynasty essentially reflects the gradual recovery of Tang court's influence in Heshuo from the Rebellion of AnLushan and ShiSiming to the reign of Emperor Xianzong.

After attaching the Tang Dynasty,the narrative of ZhangXiaozhong's family went through a progressive change from "his predecessor lived in Yan region" to "the  descendant of Xia dynasty" and then to "the descendant of Xuanyuan".It is mainly divided into two periods. The first period is the period of ZhangXiaozhong and his sons.In the epitaph of ZhangXiaozhong and his sons,their ancestors are called "people lived in Yan region",which initially constructed the ethnic origin narrative with Chinese cultures.The second period is the descendants of the ZhangXiaozhong’s family.In the epitaph of ZhangXiaozhong's grandson ZhangDa,the ancestors were finally identified as "the heir of Yin in Xuanyuan", and the county was set as Shanggu

County,where ZhangXiaozhong got his start.The construction of the descendent identity of the Yellow Emperor in the narrative of Zhang Xiaozhong's family is a reflection of the integration of national culture in the Tang Dynasty.The ZhangXiaozhong’s family showed the common characteristics of ethnic integration at that time,such as moving within the family,shaping the county,deepening the influence of Confucian cultures.At the same time, the ZhangXiaozhong’s family also showed the special characteristics of ethnic integration in terms of acquiring the Han family name for a long time,clarifying the identity of the descendants of the Yellow Emperor,and actively moving into Chang 'an.

When ZhangXiaozhong family settled in Heshuo region,there was a close relationship between the change of Heshuo region’s situations and the development and transformation of the family.During the reign of Emperor Daizong,the rebellion of AnLushan and ShiSiming was calmed,and the Department of AnLushan and ShiSiming would rely on its own strength to separate Heshuo region.ZhangXiaozhong became the subordinate of LiBaochen,the governor of Chengde. His family development was deeply influenced by LiBaochen,and he made good friends with important members of vassal towns of Heshuo region.During the rebellion in the period of Jianzhong,when Emperor Dezong cut down his vassals,the influence of Tang Court in Heshuo region was restored to some extent. ZhangXiaozhong refused to follow the rebellion and turned his allegiance to Tang Court.Under the support of Tang Court, he became the commander of the rebel army. During the reign of Emperor Xianzong,the Tang Court gradually gained the upper hand in comparison with the forces of vassal towns of Heshuo region,and ZhangMaozhao became the first He Shuojie commander who initiated the clan's entry into the dynasty.It can be seen that the development and transformation of the ZhangXiaozhong’s family in Heshuo region is the response made by the family according to the changes of the situation in Heshuo at different stages.This development and transformation shows the development and change of Heshuo situation from the Rebellion of An and Shi to the period of Xianzong emperor of the clue.First,Tang court gradually gained the upper hand in the power comparison with vassal towns of Heshuo region.Secondly,the relatively solid alliance between Heshuo Fanzhen gradually broke down. Finally, the relationship within vassal towns of Heshuo region has a lasting impact.