In order to evaluate the effects of La-involvement on biomass pyrolysis behaviors and properties of produced biochar, oak sawdust(OS) and corn straw(CS) were employed for thermogravimetric-differential thermogravimetric(TG-DTG) analysis and producing biochar with/without La-involvement. Results indicated the initial and final temperatures were shifted toward lower temperature as LaCl_3 was involved in pyrolysis. Mass loss and average mass loss rate during pyrolysis decreased with La-involvement. The kinetics indicated that the first-order reaction kinetic model well matched the pyrolysis process. As La-involved OS and CS were employed, their apparent activation energies(E_a) were reduced, and their pyrolysis characteristic index(I) were higher comparing with the OS and CS without La-involvement. Based on the produced biochar, the yield and ash content were increased by La-involvement, and the O/C ratio and iodine sorption value(ISV) were also enhanced. Obviously, the loaded LaCl_3 could facilitate pyrolysis process, and the produced biochar exhibited a great adsorption potential in aqueous solution. According to the results from FT-IR(Fourier transform infrared spectroscopy) analysis, La in pyrolysis functioned as accelerating lignin decomposition via condensing –OH, breaking aliphatic C–H and aromatic rings on lignin, cutting the links of C-O-C among the monomers in lignocellulose. LaCl_3 was finally converted to La_2O_3 in biochar after pyrolysis. In order to evaluate the effects of La-involvement on pyrolysis behaviors and properties of produced biochar, oak sawdust (OS) and corn straw (CS) were employed for thermogravimetric-differential thermogravimetric (TG-DTG) analysis and producing biochar with / without La-involvement. Results showed the initial and final temperature were shifted toward lower temperature as LaCl_3 was involved in pyrolysis. Mass loss and average mass loss rate during pyrolysis decreased with La-involvement. The kinetics indicated that the first-order reaction kinetic model well As La-involved OS and CS were employed, their apparent activation energies (E_a) were reduced, and their pyrolysis characteristic index (I) were higher vs. with the OS and CS without La-involvement. Based on the produced biochar, the yield and ash content were increased by La-involvement, and the O / C ratio and iodine sorption value (ISV) were also enhanced. Obviously, the loaded LaCl_3 coul d facilitate pyrolysis process, and the produced biochar exhibited a great adsorption potential in aqueous solution. According to the results from FT-IR (Fourier transform infrared spectroscopy) analysis, La in pyrolysis functioned as accelerating lignin decomposition via condensing -OH, breaking aliphatic C -H and aromatic rings on lignin, cutting the links of COC among the monomers in lignocellulose. LaCl_3 was finally converted to La_2O_3 in biochar after pyrolysis.