A method of measuring flow sections of a turbomachine nozzle sector relative to two reference vanes, wherein:
a) a three-dimensional numerical model of the sector is produced by digitizing;
b) numerical models are provided for the two reference vanes;
c) the reference vanes are reset at the ends of the numerical model of the sector in their assembly relative positions in the nozzle; and
d) the flow sections of the sector are determined from sections of the numerical models of the sector and of the reference vanes;
the nozzle sector having contact surfaces, and being positioned relative to adjacent nozzle sectors by putting said contact surfaces into abutment, the numerical models of the sector and of the reference vanes including models of the contact surfaces involved in putting them into their assembly relative position, and step c) being performed by putting the contact surfaces into correspondence.