To evaluate the navigation conditions of Yinpan lock in the dry season,we carry out the tests of lock navigation facilities,downstream approach channel and ship navigation.The results show that the flow conditions at the entrance area of the downstream approach channel could meet the basic requirements of navigation conditions.However,the lock time is delayed due to the design defects.It is also found that the tail water rushs down the entrance area.The flow condition would be worse during the flood season.It is recommended to check the valve opening method and observe the navigation conditions of the lock under appropriate flow rate.