1. Color: If it is a mature papaya, the outer skin is generally yellow or orange-red. If it is an immature papaya, the outer skin is generally green.

2. Touch: If it is a mature papaya, the skin is relatively soft and smooth. If you press it lightly with your finger, it will feel slightly sunken. If it is an immature papaya, the skin will be relatively hard. .

3. Spots: If it is a mature papaya, there will be some small spots on the skin of the melon, but there will be no spots on the immature papaya.

4. Fragrance: If it is a ripe papaya, it will smell like a fragrance. If not, it means that the papaya is not mature yet.

5. Melon pulp: If it is a mature papaya, the pulp inside is orange-red and the seeds are black. If it is an immature papaya, the pulp is milky white.

6. Gum: If it is a mature papaya, there will be sticky gum, which is sugar gum, on the skin of the melon, but there is no such thing in immature papayas.