An RPC carpet covering similar to 10(4) m(2) (ARGO-YBJ experiment) will be
installed in the YangBaJing Laboratory (Tibet, P.R. China) at an altitude o
f 4300 m a.s.l.. A test-module of similar to 50 m(2) has been put in operat
ion in this laboratory and about 10(6) air shower events have been collecte
d. The carpet capability of reconstructing the shower features is presented
.