The invention discloses a planning method for failure diagnosis tests, comprising following steps: a unidimensional test space is divided into a plurality of blocks, length of each block is allocated according to the size of the test space, then test blocks are allocated to singleboards which are needed diagnosis; a plurality of blocks used by singleboards are interlinked to form a block chain list structure, the attribute information of an identification block comprises block attributive singleboard types, a block sequence number of the block chain list, the next block sequence number of the block chain list and the number of tests occupied by the block; according to the allocation of the singleboard test space, each singleboard block chain list is initialized. The invention improves maintainability of the diagnosis test space, reduces initializing difficulty of the diagnosis test space.