Do I need a transit visa for transit in Switzerland?

No need. Only if the nationality of the passport is on the list of countries "must obtain airport transit visa" on the website of the Swiss Federal Office for Migration (SEM), and you are transferring at a Swiss airport, you need to obtain an airport transit visa in advance, and China is not on this list. Therefore, if you hold People with Chinese passports can stay in the international transit area of ??Swiss airports without applying for any Swiss visa.