To address the disconneetion between traditional verifieation experiments and scientife researehpractiee in the teaching reform of the professional course Fiber Optie Sensors and Their Applications.In thispaper , with intensity modulation and phase modulation fiber sensor as the core ,a single mode-multimode-foueore fiber cascade strueture is designed as an innovative experiment of sensing struclure, Therefore,a three-in.one teaching model of knowledge consolidation, seientifie researeh practice and innovation training isconstructed.The design of oplical fiber sensing system which applied in liquid coneentration detection iscompleted by students through the practical tasks of the whole process of literature research, sensorpreparation , performanee testing and data analysis."The results show that the sensitivity of suerose solution ofthis sensor ean reach 0.16644nm/96 .The fit degrees of the interferenee valley wavelength , intensity and sueroseeoneentration are 0.9801 1 ,0.93636, respectively.By eonducting innovative currieulum experiment explorations,this initiative has not only effeetively stimulated shudents’research interests but also enhanced their practicacompetencies and innovative thinking.lt provides an extension of the integration of seience and edueation foeultivating high-quality applied talents with seientilie researeh accomplishment and innovative thinking underthe background of new engineering.