Hi guys,i just wanna knows that why the transaction fee for bitcoins is increasing everyday.Some days before i send bitcoin to a trader the fee was 0.0005btc but yesterday i repeat the
same transaction same amount then the fee was 0.0006 btc.
Please correct me if i am posted in wrong section.

This can be due to the "peak hour" period when you are sending your btc. The system will automatically choose the highest possible rate for sending. In another words it can also be the fact that there are more crypto user.