Abstract: Law language has the functional characteristic and language characteristic.The functional characteristic includes three aspects,mainly:social nature,logicality and technicality.Main behaviour of social nature is:compelling force,adjustment,general availability,procedure and culture.The logicality mainly shows by:assuming the form,arrangement of ideas and scientificalness handling sanction.Technicality shows by:main characteristics such as accuracy,rigorousness,authority,being realistic and high-efficient.Language characteristic shows by:main language sign,combination and characteristics such as polymerization,rhetoric,style and social dialect variety.