Usually, PI codes are built up from a country code (2 digits) and then a unique code within your reception area (also 2 digits). I tried Googling for China PI RDS, but I couldn't find anything - for many countries there are lists of stations with their codes but apparently not for China (or not in English).
If you know the codes for other stations in your area, you PROBABLY need to take the first 2 digits and think of some new values for the last 2.
Now it's also possible that there is an organization in China that gives out PI codes - this may be different per country. If you use the same code as another station you might steal their listeners (or they might steal yours).
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