The 1978 Xinhua dictionary (新华字典) I still keep at home is where most of this started for me — the kind with the red-cloth spine. Three characters inside it no longer exist: 歺 for 餐 (meal), 仃 for 停 (stop), 氿 for 酒 (liquor). They are not typos and they are not traditional forms. They are the residue of a reform that ran for about eight years and was then cancelled.
A friend who started learning Mandarin last year asked me why "Chinese has two writing systems." It doesn't, quite. Simplified Chinese characters are not a separate script — they are the result of decisions made on specific dates, mostly between 1956 and 1986, and then frozen. These are the eight dates I'd hand someone, in order.

1935: a 324-character list, suspended within a year
Short forms were not invented by any committee. People had been writing contracted versions of common characters for centuries — the cursive 草书 script is basically a shorthand — and by the 1930s these "handy characters" (手头字) were in wide informal use. In August 1935 the education ministry published 《第一批简体字表》, a list of 324 characters already being written that way, and told schools and publishers to adopt them. By 1936 it had been suspended after heavy opposition. That first attempt is worth knowing because it shows what simplification was at the start: writing down what people already did, not designing new letters.
1956: 515 characters and 54 components become official
The reform that actually took hold began on 28 January 1956, when the State Council adopted 《汉字简化方案》: 515 simplified characters plus 54 simplified components, rolled out in batches over the next few years. Those 54 components are the part most learners never hear about, and they are why simplified Chinese characters feel systematic rather than arbitrary. Once 言 → 讠, 食 → 饣 and 金 → 钅 were fixed, everything containing them changed at once: 語 became 语, 飯 became 饭, 錢 became 钱. Learn the component once, and dozens of characters come with it.
1958: pinyin is approved, and reading and typing split apart
On 11 February 1958, the National People's Congress approved 《汉语拼音方案》, the romanization you see on street signs and in every dictionary. It was never meant to replace characters — that idea was floated and explicitly set aside. What it changed was the way in. Chinese children learn pinyin before they can write 300 characters, and I type Chinese every day on a pinyin keyboard without recalling a single stroke order. I now write fewer characters by hand than I did at ten, which is an odd thing to admit about yourself and one I suspect half the people I know share.
1964: one master list, 2,238 characters
In 1964, the Committee for Reforming the Chinese Written Language published 《简化字总表》, and simplification stopped being a programme and became a table. The 2,238 characters in it sit in three parts: 352 that never serve as components, 132 that do (plus 14 components), and 1,754 produced by extending those to everything else. That arithmetic answers "how many characters were simplified" — a fixed, countable set, not an open-ended process. The list was meant to be complete, and that intention matters more than the exact digits.
1977: the second round nobody under forty remembers
Then they tried again. The draft second scheme (二简字), published on 20 December 1977, pushed much further, and this is where my dictionary comes from — 歺, 仃 and 氿 all belong to it. The figure usually quoted for the draft is 853 characters in two tables; I've seen it cited consistently, though I can't say I've checked a primary source. The flaw showed up fast: too many words collapsed onto one shape, so 餐 became 歺 and 停 became 仃, and you could no longer tell from the character alone whether you were reading a menu or a bus stop. Newspapers used it, textbooks used it, and it was chaotic in the way only a reform applied faster than people can read tends to be.
1986: withdrawn, and the list settles at 2,235
On 24 June 1986 the State Council called a halt: the second scheme was abandoned and its forms stopped being used in public. In October 1986 a revised 《简化字总表》 was reissued with 2,235 characters, three fewer than the 1964 version after small corrections. That is the set people write today. Everything since 1986 has been cataloguing and cleanup — no further round of simplification has been introduced, and I don't expect one. When you spot 歺 chalked on a board in an older shop, it's a habit from this decade, not a mistake.
2000: it stops being a campaign and becomes law
The Law on the Standard Spoken and Written Chinese Language was passed on 31 October 2000 and took effect on 1 January 2001. It fixed simplified characters and Putonghua as the national common written and spoken forms, and — the part people forget — it names the places where traditional characters remain legitimate: calligraphy and seal carving, hand-lettered signboards, and material that needs them for research or publication. So the legal position isn't "traditional characters are banned." It's "simplified is the default, with named exceptions," which is why you see 繁体 on a temple plaque and nobody minds.
2013: 8,105 characters, in three tiers
The most recent step is the 《通用规范汉字表》, published by the State Council on 5 June 2013. It lists 8,105 characters across three tiers: 3,500 in tier one (the everyday set), 3,000 in tier two, and 1,605 in tier three, covering place names, personal names, technical terms and characters you mostly meet in classical text. It isn't a simplification at all — it's an inventory, and a useful reality check. That 8,105 is the entire standardized stock, and nobody walks around holding all of it in their head.
What I'd tell you if you're learning this
Start with simplified Chinese characters, because that is what's on every sign, menu and phone screen you'll meet here, and leave the rest until you have a reason for it. The number I've seen quoted for tier one is that those 3,500 characters cover about 99.5% of modern text. I've never managed to verify the corpus study behind that, so treat it as a rule of thumb, not a measurement.
You will still meet traditional characters, mostly in three places: old shop signs, calligraphy, and anything printed before the 1950s. There is no shortcut — you just learn the shapes you personally keep bumping into. Mine are 餐廳 and 醫院, because I read a lot of old menus.
As for the 二简字 set, recognize it and don't use it. Writing 歺 today marks you as either very old or holding a very old dictionary. I'm not a linguist, incidentally — I'm someone who grew up writing these characters and then had to explain them to friends in English. If one of my dates is off by a day, the shape of the story still holds: characters were simplified on eight specific dates, the list froze in 1986, and it was counted again in 2013.
Simplified Chinese characters were not created by one reform. They were settled across eight dates from 1935 to 2013, frozen at 2,235 characters in 1986, and inventoried at 8,105 in 2013.
Frequently asked questions
When did Chinese character simplification start?
The reform that actually took hold began on 28 January 1956, when the State Council adopted 515 simplified characters and 54 components.
What is the official character list today?
The 通用规范汉字表, published on 5 June 2013, lists 8,105 characters across three tiers.
Should I learn simplified characters?
Yes, start with simplified, because that is what is on every sign, menu and phone screen you will meet in China.