This study compiles a comparable corpus by utilizing a diachronic translated Chinese corpus and the original Chinese corpora LCMC and ToRCH 2009,in order to investigate the diachronic changes in the processing complexity of translated Chinese and original Chinese in different registers. This investigation is carried out through the examination of dependency distance and dependency direction metrics for noun phrases in translated Chinese and through the comparison of these metrics with those of the original Chinese language. The findings of the research are as follows: 1)The overall processing complexity of translated Chinese shows a fluctuating upward trend, particularly evident during the decades from 1930 to 1960,but with occasional minor decreases in the 1990s; 2)Consistency in processing complexity for translated Chinese is observed across different text genres; 3)Translated Chinese exhibits higher processing complexity than original Chinese. The study also identifies that translated Chinese displays characteristics of regularization and normalization, reflecting the influence of connectivity strength and gravitation pull in translation.