We will present our current work on offline search for supernoave in the SNLS project. SNSL provides us with a well-measured sample of SNIa with redshifts between 0.2 and 1. Spectroed by 8m-class telescopes, they will allow us to measure cosmological parameters with a precision of 3%25 and the dark energy equation of state parameter w at 7%25. Nevertheless, selection of objects used by SNLS still includes several potential biases due to human selection and depth limits in the spectroscopy, for example. It is necessary to make a complete search for all varying objects in our fields to know precisely the impact on cosmology of the potential biases. In this poster we present the current status of this offline study.