In order to solve the problem of multi-component monitoring in oil produetion, based on optical fiher technology and electricalconductanee technology, suecessfully develops a fiber-optie and conductanee integrated sensor for muli-ceomponent monitoring inpetroleum production. FOCIS simulation model is estahlished using ZEMAX ray tracing method and FEM method. The electrie fielddistribution of the conduclance measurement module(CMM), CMM response characteristics, the retum light intensity distribution ofoptical fber measurement module(OFMM) and OFMM response characteristics, ete. are simulated and analyzed. The measured valuesof CMM and OFMM show a good linear relationship with the standard rates of phase content under diferent oil-gas-water three-phase flowpattems, and the erors of the measured rates of phase content are all within 5%,The FOCIS on site experiment test was caried out ina vertical pipeline with an inner diameter of 32mm. The experiment results show that under the working conditions where the gas flow rate is 5, 20,40m³/d,the total oil and water flow rate is 10, 30,50,70 m³/d and the liquid phase water content is 50%,60%,70%,80%,90%,the erors of the measured rate of water content and rate of gas content are wihin 5%。Both simulations and experimentsprove that the FOCIS muli-component monitoring of oil, gas and water is feasible and effective