Dear Sir/madam

This is Mohsin form Lahore, Pakistan.
I would like to know the requirements to apply for Chinese Visa.
I already visited once in China for my business purpose..
Last time embassy asked me forr Police letter and REcommendation letter as that was my first time.
I want to know that this time i also need these two documents(?Police letter and recommendation letter for chamber)..
Pls reply yes or no?
Also this year if any new documentation added pls also tell mme so that i can save my time..

Regards
Mohsin Ali Bhatti