Mortgagee should choose one of the two rights to exercise when the claim of additional mortgage reencountered with the right of subrogation in another thing.
增担保请求权是在抵押物价值减少的情况下,抵押权人所享有的保全抵押权的一种权利;增担保请求权只能通过诉讼外请求的方式行使,增担保的种类包括保证、抵押权、质权;增担保请求权与物上代位权发生竞合时,抵押权人得择一行使;在增担保请求权不能实现时,抵押权人得要求债务人提前清偿债务;我国应当在现有立法的基础上,进一步完善增担保请求权制度。