Beyond the standard model at Tevatron

This article presents recent results of searches for physics beyond the Standard Model using the CDF and the D0 detector at the Fermilab Tevatron Collider. All results shown correspond to analysis performed using the past 1992--1996 Fermilab Tevatron run 1 data (roughly 100 pb-1 per each experiment). In particular, the authors describe recent Tevatron searches for scalar top in the b + ell + missing-ET channel, for squark and gluinos using like-sign dileptons (LS), for large extra space-time dimensions and the search for leptoquarks and technicolor in the missing-ET+heavy flavor jet events. Tight limits on the existence of such models have been set