We simulate lattice quantum chromodynamics on asymmetric lattices with improved actions, where quenching approximation is used. These lattices have a spatial lattice spacing as at 0.3 and 0.4 fm, and a temporal lattice spacing at from 0.14 to 0.08 fm. The lattice spacing error due to as is greatly reduced through improving both quark and gluon actions at a certain level. We find that masses of mesons have weak dependence on both lattice spacings, while the as and at dependence for baryons is more significant. With suitable modelling of these dependences, we are able to obtain the nucleon mass in agreement with the experiment.