The mass spectrum and strong decays of the X ( 1870 ) and η 2 ( 1870 ) are analyzed. Our results indicate that X ( 1870 ) and η 2 ( 1870 ) are the two different resonances. The narrower X ( 1870 ) seems likely a good hybrid candidate. We support the η 2 ( 1870 ) as the η 2 ( 2 1 D 2 ) quarkonium. We suggest to search the isospin partner of X ( 1870 ) in the channels of J / ψ ⟶ ρ f 0 980 π and J / ψ ⟶ ρ b 1 1235 π in the future. The latter channel is very important for testing the hybrid scenario.