La2/3Sr1/3MnO3+xWO3（x=0

2

5%） system polycrystalline ceramic samples were prepared by sol-gel method.The experiment results showed that with increasing WO3 doping level

the resistivity increases obviously

and the metal-insulator transition temperature Tp decreases.Under a magnetic field of 1.4 T

the room temperature magnetoresistance increases from 5% to 15% when 0≤x≤ 12.5%

which increases 200%.When 12.5%

<

x≤25%

it decreases directly from 15% to 0.It provides the experimental proof for the potential application of magnetoresistance materials at room temperature.