  We present the real interpolation with variable exponent and we prove the
basic properties in analogy to the classical real interpolation. More
precisely, we prove that under some additional conditions, this method can be
reduced to the case of fixed exponent. An application, we give the real
interpolation of variable Besov and Lorentz spaces as introduced recently in
Almeida and H\"ast\"o (J. Funct. Anal. 258 (5) 1628--2655, 2010) and L.
Ephremidze et al. (Fract. Calc. Appl. Anal. 11 (4) (2008), 407--420).
