In this paper, we first propose the concepts of BiHom- \(\Omega \) -associative algebras, BiHom- \(\Omega \) -dendriform algebras, BiHom- \(\Omega \) -pre-Lie algebras and BiHom- \(\Omega \) -Lie algebras. We then obtain a new BiHom- \(\Omega \) -associative (resp. Lie) algebra by defining a new multiplication on a BiHom- \(\Omega \) -associative (resp. Lie) algebra with the Rota-Baxter family of weight \(\lambda \) . In addition, we generalize the classical relationships of associative algebras, pre-Lie algebras, dendriform algebras and Lie algebras to the BiHom- \(\Omega \) version.