Liquid crystal alignment agents for forming horizontal alignment film and liquid crystal display element

The invention provides a liquid crystal oriented agent used for forming a horizontal alignment film, and a liquid crystal display element. Wherein, the liquid crystal oriented agent comprises polymer selected from at least one of polyamide acid and imide polymer of the polyamide acid and mixed solvent. The mixed solvent comprises: a first solvent selected from at least one of N-methyl-2-pyrrolidon, gamma-butyrolactone, 1,3-dimethyl-2-imidazolinone, N,N-dimethylformamide and N,N-dimethylacetamide; a second solvent selected from at least one of Butyl Cellosolve, diacetone alcohol, propylene carbonate, diethylene glycol diethyl ether and ethide-3-ethoxypropionate; a third solvent expressed by the following formula (A) and with the weight rate relative to the total solvent weight in the range of 0.1wt% to 15wt%. The formula is R -Z-R (A). R and R are alkyl. Z is -COO-, -O- or -CO-. Wherein, when Z is -COO-, carbon number of R and R totaled in the range of 6 to 9, and when Z is -O-, the carbon number of R and R to