Construction laser system, comprising at least • a rotation laser, having a laser unit and a continuously rotatable deflection means, for emission of a rotating laser beam such that the rotating laser beam defines a reference surface, • a laser receiver having a laser beam detector extending at least over a one-dimensional region on the laser receiver, so that the laser receiver is formed in order to generate an output signal as a function of incidence of the laser beam on the laser beam detector, • an evaluation unit for determining a laser receiver direction, in which the laser receiver lies in sight of the rotation laser, • a memory in which the following are stored: □ a multiplicity of defined rotation angle ranges relating to rotation of the deflection means, and □ a digital code respectively assigned uniquely to the respective rotation angle ranges, and consisting of a state value sequence which is based on a defined sequence of states relating to the laser beam, the states being taken from a set of at least two defined different discrete states relating to the laser beam, and • a control unit for control of the at least two different discrete states, such that, in the respective rotation angle ranges, the sequence of states relating to the laser beam, which corresponds to the respective rotation angle range, is respectively generated, • wherein the evaluation unit is formed □ in order to acquire an output signal sequence of successively generated output signals, □ in order to identify a state value sequence among the stored state value sequences, which corresponds to the output signal sequence, and □ in order to determine the laser receiver direction as a function of that rotation angle range which is assigned to the code corresponding to the identified state value sequence, characterized in that the control of the laser unit is effected synchronous with the rotatable deflection means such that the sequence of states with respect to the laser beam is generated by means of successively occurring crossings of the respective rotation angle range, in the course of a series of rotational passes of the deflection means. • a rotation laser, having a laser unit and a continuously rotatable deflection means, for emission of a rotating laser beam such that the rotating laser beam defines a reference surface, • a laser receiver having a laser beam detector extending at least over a one-dimensional region on the laser receiver, so that the laser receiver is formed in order to generate an output signal as a function of incidence of the laser beam on the laser beam detector, • an evaluation unit for determining a laser receiver direction, in which the laser receiver lies in sight of the rotation laser, • a memory in which the following are stored: □ a multiplicity of defined rotation angle ranges relating to rotation of the deflection means, and □ a digital code respectively assigned uniquely to the respective rotation angle ranges, and consisting of a state value sequence which is based on a defined sequence of states relating to the laser beam, the states being taken from a set of at least two defined different discrete states relating to the laser beam, and □ a multiplicity of defined rotation angle ranges relating to rotation of the deflection means, and □ a digital code respectively assigned uniquely to the respective rotation angle ranges, and consisting of a state value sequence which is based on a defined sequence of states relating to the laser beam, the states being taken from a set of at least two defined different discrete states relating to the laser beam, • a control unit for control of the at least two different discrete states, such that, in the respective rotation angle ranges, the sequence of states relating to the laser beam, which corresponds to the respective rotation angle range, is respectively generated, • wherein the evaluation unit is formed □ in order to acquire an output signal sequence of successively generated output signals, □ in order to identify a state value sequence among the stored state value sequences, which corresponds to the output signal sequence, and □ in order to determine the laser receiver direction as a function of that rotation angle range which is assigned to the code corresponding to the identified state value sequence, □ in order to acquire an output signal sequence of successively generated output signals, □ in order to identify a state value sequence among the stored state value sequences, which corresponds to the output signal sequence, and □ in order to determine the laser receiver direction as a function of that rotation angle range which is assigned to the code corresponding to the identified state value sequence,