Entries basically means the number of times you can enter Mainland China in a period of time (listed on the visa itself). The visa will become void if it goes beyond the date which relates to "Enter Before". This is still the case even if there are some entries left. Entries can vary from single, double and multiple depending on the type of visa issues. A single entry visa is listed like this > 01 (壹) A double entry visa is listed like this > 02 (贰) A multiple entry visa is listed like this > as M (多)