The invention relates to a method for arranging temperature sensors in a building unit. The method comprises the following steps: simulating an air temperature gradient field in the region of the unitby software; selecting key positions from the air temperature gradient field; setting the maximum detection radius R of each temperature sensor; classifying all the key positions into m classes by aclustering method, and enabling a jth class of key position set Hj (hu, ..., hv) and the jth temperature sensor sj to be in multiple-to-one relation, wherein j is greater than or equals to 1 and is smaller than or equals to m; taking the temperature sensor sj as the center so that the width of a rectangular boundary surrounded by all the key positions in the key position set Hj is smaller than orequals to R; and finally outputting coordinates (xsj, ysj) of the arrangement position of the temperature sensor sj. While the number of the temperature sensors is reduced, the arrangement positions of the various temperature sensors in the region can be planned reasonably, so that the efficacies of the various temperature sensors can be utilized well.