1955 when the military rank system was first implemented, the situation was different from now. At that time, there was a quasi-regiment. Except for a few senior officers or special circumstances, directly under the authority, the head of the regimental headquarters and logistics department, is usually designated as a quasi-regimental level, not a deputy regimental level. In 1955, the regimental level was usually equivalent to colonel, lieutenant colonel and major. Those with more experience are awarded the rank of colonel, and a few with less experience are awarded the rank of major, with the rank of lieutenant colonel as the main one. The rank of deputy regimental commander is based on the rank of major. Those with deeper qualifications can be awarded the rank of lieutenant colonel, and a few with lower qualifications can also be awarded the rank of captain.
The regimental chief of staff at the quasi-regimental level is mainly the rank of major and captain, and few people are awarded the rank of lieutenant colonel (note: 1955 had the rank of captain, which is different from now). General Yue Zhenhua, a well-known senior colonel battalion commander, was the head of the anti-aircraft artillery regiment in the early days of the People's Republic of China. 1955 was awarded the rank of major when he was awarded the title, belonging to the youth league mentioned above. As for the new battalion commander being a colonel, it is not a demotion. Yue Zhenhua served as the battalion commander or regiment level, but at that time, in order to be on an equal footing with the Soviet Union, the grass-roots establishment of the missile force was designated as a battalion, but in fact the battalion was still a regiment level, and there was a battalion commander's staff! At that time, ordinary battalion-level organizations had no chief of staff.
During the Republic of China, it was more complicated. During the period of Beiyang government and the early period of Nanjing National Government, warlords scuffled and the ranks were in a mess. If they keep chopping, it's still chaotic, so I won't talk about it here, only after the Nanjing National Government redistributed their ranks in 1936. In order to solve the problems of early rank abuse, 1936, the Nanjing National Government re-formulated a new rank system and summarized the separation of official titles. Job ranks are linked to jobs, and civil servants' ranks are linked to lifelong treatment. After not holding a specific post, the post rank will be revoked immediately, and all treatment will refer to the civil service rank. This has caused a problem, that is, the decoupling of job rank and civil servant rank.
Take the regiment chief of staff as an example. During the Republic of China, the most mainstream colonel rank was Lieutenant Colonel. But this is only a post rank, and the civil service rank of the chief of staff of the regiment is likely to exist only as an army major or even an army captain. In other words, when the regimental chief of staff is appointed, the rank of regimental chief of staff is lieutenant colonel (lieutenant colonel and regimental chief of staff must appear at the same time) and enjoy the treatment of lieutenant colonel. Once he leaves office, the chief of staff of the regiment can only refer to the treatment of civil servants. If his civil servant ranks as an army major, he will only enjoy the treatment of major, not lieutenant colonel.
However, due to the existence of local strength groups, the phenomenon of excessive conferment of ranks still exists during the Republic of China and even after 1936, such as the head of major general, which is not uncommon. Then there are the reorganized divisions and brigades after the end of the Anti-Japanese War. These divisions and brigades are actually "shields" for Jiang to prevaricate Americans and public opinion. They are called divisions and brigades, but they are actually armies and divisions. Therefore, the ranks of all officers in its subordinate units are much higher than those of the original divisions, brigades and regiments.
I lack military experience, and there may be a little knowledge, shortcomings and fallacies in the article. Please forgive me, correct me, thank you!