A direct dark matter search experiment, XMASS, uses 800kg of liquid xenon and 
its fiducial mass is 100kg. It uses newly developed background PMTs and 
makes use of self-sheilding mathod to reduce external backgrounds. The 
backgroud rate in the signal region is expected to be 10^-4 /kg/keV/day and it 
will achieve the experimental sensitivity of 10^-45 cm^2 for the spin 
independet interactions for the dark matter mass of around 100GeV. The new 
underground cavity to house the experiment has completed in February this 
year and the construction of the XMASS experiment will finish by summer, 
2009. 
We will discuss the status of the XMASS experiment.