The stability of minor armor blocks are studied further based on two types of model tests.The minor armor blocks are positioned on the slope 1.5 times H13% under the MWL in test 1，and on the berm 1.5 times H13% under the MWL in test 2，with Hd=0.11～0.14 and Hd=0.09～0.11 respectively.It is found that the stability of armor blocks on the slope is better than that on the berm.Following conclusions are drawn from the tests：1)The stable weight of minor armor blocks on the slope 1.5 times H13% under the MWL is 13 of that of main armor blocks； 2) The stable weight of minor armor blocks on the berm 1.5 times H13% under the MWL is 0.9 of that of main armor blocks.