The extra-solar planet WASP-lb, discovered by SuperWASP consortium in 2006, wasobserved through R filter using the 1-meter telescope with CCD camera at Yunnan Observatoryon November 11, 2006. The systematic errors in photometric data were reduced by meansof Tamuz et al. (2005) and Collier Cameron et al. (2006)'s algorithms. In order to estimatethe parameters of the system, the MCMC (Markov Chain Monte Carlo) analysis is applied tofit the observed light curve. The following parameters of the system are derived: R_p=1.44R_J,M_p=0.88M_J, R_*=1.52R_⊙,a=0.0396AU. The new parameters of the planet imply its low density,which agrees to the previous results.
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