An experiment using field emission microscopy has been performed to investigate the kinetics of Pd adlayer on W surface, such as diffusion, thermal and field desorption processes, and coadsorption of hydrogen and palladium on W surface. The work function upon Pd adsorption on W surface is φ=5.0eV at maximum. When θ
Pd=2.0, for the coverage of Pd there are two states of Pd adlayer on W surface, the weakely bound state that disappears at
T=1100_??_1200 K and the more stably bound state that desorbs at
T=1500_??_1700 K. Field emission current variation in the field desorption process of Pd adlayer on W surface can be divided into 3 stages: 1) the desorption of the overlayer, 2) the most stable adsorption state and finally, 3) the desorption of the monolayer, When the θ
Pd_??_1.0, the field emission current varies strongly upon the exposure to hydrogen. However, influence is observed at θ
pd_??_2.0.
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