This paper first uses the phase-order encoding and modulation methods to superimpose the phase-order information into the phase-shifting image, and then proposes a method to directly use the phase-shifting image to unwrap the phase. On the projection side, this paper firstly proposes an adjacent non-repetitive De Bruijn sequence, uses this sequence to encode the phase order, and then modulates and superimposes the periodic order code sequence into the multi-step phase shift image. Correspondingly, in the decoding stage, this paper demodulates and decomposes the wrapped phase and period order coding sequence from the captured phase-shifting image at the same time, then restores the true period order information through sequence matching, and finally unwraps the absolute phase accurately. We take the four-step phase shifting method as an example. Compared with the traditional temporal phase unwrapping algorithm, the method in this paper reduces the number of projection images from 10 (64 phase periods) to 4, which improves the measurement efficiency.