The up- conversion fluorescence phenomenon of Er0.1La0.9P5O14 noncrystallinepumped by a pulsed dye laser is studied. The peaks of the up-conversion fluorescence are(552.2, 545.7, 542.9) nm, 525.0 nm, 468.8 nm, 452.2 nm, (411.2, 407.0) nm, 384.1 nm and 380.7 nm. The luminescence(552.2, 545.7, 542.9) nm, 525.0 nm, (411.2 nm, 407.0) nm and 384.1 nm can be ascribed to resonant step by step absorption oftwo phtons by a single ion and 468.8, 452.2 and 380.7 nm are generated in three-photonprocesses.