Visa for international fight conection. Should I change my entry permit?

I'm Brazilian and I'm going to PRC for a Congress. But before my Congress I'm going to Borneo. My bill is São Paulo (Brazil) x Hangzhou. And after 4 hours waiting in HGH airport I'll get another flight to Borneo. After a week I'll return to Hangzhou for the Congress. My question is: In my case, I need double entries? I have one entry permit, but I'm afraid that connection will mean an entry.