We introduce BV-algebra structures on the homology of the space of framed long knots in Rn in two ways. The first one is given in a similar fashion to Chas-Sullivan's string topology . The second one is defined on the Hochschild homology associated with a cyclic, multiplicative operad of graded modules. The latter can be applied to Bousfield-Salvatore spectral sequence converging to the homology of the space of framed long knots. Conjecturally these two structures coincide with each other.