The immigration is one of the more relevant phenomena that at present they take place in Spain, both for his magnitude and for the economic effects that can stem. For this reason, the aim of the work has been to analyze some of the most central labor aspects relative to the reception of immigrant labour and his possible effects on our labour market.

For it, and after checking the principal theoretical background on this matter, the statistical available sources for his study and the characteristics of the immigrant resident population in Spain, the investigation has considered to answer to three fundamental questions: (i) To what extent do the immigrant workforce compete with the national labour?; the (ii) Do they present the immigrant patterns of labor mobility different from those of the national labour?; (iii) Do the immigrants assimilate his labor rules to the own ones of the national workforce?

The obtained results point, first of all, that the immigrant labour competes only moderately with the national, so that although there are observed effects of negative sign on the labor opportunities of the nationals associated with the immigrant’s arrival, these re-dress a limited magnitude. Secondly, it is observed as the immigrant population that it presents patterns of mobility more flexes than the nationals, with major inflows and outflows of the employment. Finally, both populations present labor rules (activity, employment and unemployment) and labor conditions (sector, occupation, contract…) different and persistent in the time.