An import tax is a charge that you will have to pay to the Israeli authorities if the total value of your package exceeds a certain threshold. There is a fixed limit of 75 dollars for Israel. 
As a reminder, the courier company is not responsible for any taxes that may arise. It is the sender’s responsibility to ensure that there are no increases in taxes. If you do your international shipping from China to Israel in this manner, you will avoid any additional costs that will be borne by the receiver.