Array and method for detecting spatial information of nucleic acids

A nucleic acid array for detecting spatial information of a nucleic acid in a sample, which comprises a solid support (e.g., a chip) with multiple kinds of carrier sequences attached to its surface, in which each kind of carrier sequence occupies a different position in the array, said each kind of carrier sequence comprises a plurality of copies of the carrier sequence, and the carrier sequence in the direction from 5′ to 3′ comprises a positioning sequence and a first immobilization sequence, wherein,

• the positioning sequence has a unique nucleotide sequence corresponding to the position of the kind of carrier sequence on the array;
• the first immobilization sequence allows annealing to its complementary nucleotide sequence and initiating an extension reaction.