The invention discloses a method for determining tunnel construction positions corresponding to different designed explosive dosages when urban shallow-buried tunnel explosive design is conducted based on known controlled vibration velocity and protected buildings are located outside a tunnel contour line. According to the method, a reasonable method is used for establishing a coordinate system of a tunnel curve and a building contour line and an equation of locus according to the shape characteristics of a tunnel and a building; the extending lines of the building contour line divide the tunnel curve into a plurality of sections; and the piecewise function expression of a tunnel section safety distance corresponding to the designed dosage is deduced. After the minimum explosive dosage and footage corresponding to the shortest distance from the building to a blasting source are determined, the dividing line positions/pile numbers of all blasting dosages at the tunnel can be acquired precisely according to the obtained function expression, and the safety range of the tunnel designed footage can be determined. A precise method is provided for determining the safety blasting range of tunnel footage under a complex building environment.