The 1^st Radioactive Ion Beam Line in Lanzhou (RIBLL1) is composed of production, separation, identification and focusing systems with a total length of 35 meters. It was designed as an antisymmetric spectrometer with a double achromatic structure by integrating the advantages of 4 running radioactive beam facilities at intermediate energies in the world. RIBLL1 improves the identification ability of radioactive beams with a mass resolution (A/ΔA) greater than 200, a 10% momentum acceptance, a maximum magnetic rigidity of 4.2Tm and the ability of providing more than one thousand short live ion beams. RIBLL1 have provided a lot of radioactive ion beams for the domestic and abroad users to carrying the experiments. A series of important achievements have been obtained, such as finding out the important evidences of halo structure of several radioactive nuclei, discovering the ⁴He+⁸He cluster structure of ¹²Be for the first time, studying the β-delayed spectra of ^18,21N, the mechanism of di-proton emission of  ²⁸P and ²⁸S, the production mechanism of ⁴⁰Ar fragmentation and the interesting behavior of elastic scattering of the proton drip-line nuclei ⁸B and ⁹C.