When it comes to the service of surface mail, we need to pay attention to the fact that the charging standard is calculated according to the mailing speed and the weight of the parcel. First of all, the speed of ordinary parcel service of China Post is about 7 to 1 days, and its fee structure includes several parts:

1. Parcel fee: This is the basic mailing fee. According to the actual weight of the parcel, every 5g is a billing unit, and less than 5g is also charged.

2. Registration fee: regardless of the weight of the package, the registration fee will be charged to 3 yuan, which is to ensure the safe delivery of the mail and add additional tracking service.

3. insured fee: if customers choose insured service, they will be charged according to the insured amount, which will vary with the insured amount.

4. Documentary fee: The cost of handling and managing mailing documents is .5 yuan, which is also part of the cost of surface mail service.

to sum up, the charging standard of surface mail is determined according to the weight of the parcel, whether it is registered or not, and whether it is insured. The specific fee will be the sum of the parcel fee, registration fee, insured fee and document fee. In practice, consumers need to calculate the exact cost according to their own needs and package weight.